improved detection for checkmate

.editorconfig

@@ -8,3 +8,7 @@ trim_trailing_whitespace = true
 
 [*.{cc,cpp,hpp,h}]
 insert_final_newline = true
+
+[makefile]
+indent_size = 4
+indent_style = tab

.gitignore

@@ -1,3 +1,4 @@
 .vscode/
 *.exe
 *.txt
+chess

ChessPieces/ChessPiece.cpp

@@ -127,6 +127,54 @@ ChessPiecePosition ChessPiece::GetPosition() {
   }
 }
 
+/**
+ * Gets all chess piece positions of the chess piece which are still protective for the king.
+ * Any position between the attacker chess piece and the current chess piece is protective for the king.
+ * The position is also protective for the king if the chess piece can beat the attacker chess piece.
+ * @param chessboard A pointer to the chessboard.
+ * @param positions A set of positions the chess piece can move next (also positions are not protective).
+ * @return A set of chess piece positions which are still protective for the king.
+ */
+std::set<ChessPiecePosition> ChessPiece::GetProtectivePositions(Chessboard* chessboard, std::set<ChessPiecePosition> positions) {
+  ChessPiece* chessPieceKing = chessboard->GetChessPieceKing(this->GetColor());
+  std::set<ChessPiecePosition> protectivePositions;
+
+  for (ChessPiece* chessPiece : chessboard->GetChessPieces()) {
+    if (chessPiece->GetColor() != this->GetColor()) {
+      std::set<ChessPiecePosition> positionsStay = chessPiece->GetNextPositions(chessboard, {});
+      std::set<ChessPiecePosition> positionsMove = chessPiece->GetNextPositions(chessboard, {this->GetPosition()});
+
+      if (positionsStay.count(chessPieceKing->GetPosition()) == 0 && positionsMove.count(chessPieceKing->GetPosition()) == 1)  {
+
+        // the position is protective if the current chess piece can beat the attacker chess piece.
+        if (positions.count(chessPiece->GetPosition()) == 1) {
+          protectivePositions.insert(chessPiece->GetPosition());
+        }
+
+        // every position between the current chess piece and the attacker chess piece is also protective.
+        std::string step = ChessPiecePosition::GetStep(chessPiece->GetPosition(), chessPieceKing->GetPosition());
+
+        if (step.empty()) {
+          continue;
+        }
+
+        ChessPiecePosition currentPosition = chessPiece->GetPosition();
+        ChessPiecePosition* nextPosition = &currentPosition;
+
+        while (nextPosition = nextPosition->NextFromString(step)) {
+          if (nextPosition->ToString() == this->GetPosition().ToString()) {
+            break;
+          } else if (positions.count(*nextPosition) == 1) {
+            protectivePositions.insert(*nextPosition);
+          }
+        }
+      }
+    }
+  }
+
+  return protectivePositions;
+}
+
 /**
  * Gets a set of all positions along the rank.
  * @param chessboard A pointer to the chessboard.
@@ -300,7 +348,7 @@ void ChessPiece::SetPosition(ChessPiecePosition position) {
  */
 void ChessPiece::UpdateNextPositions(Chessboard* chessboard) {
   if (this->IsProtective(chessboard)) {
-    this->SetNextPositions({});
+    this->SetNextPositions(this->GetProtectivePositions(chessboard, this->GetNextPositions(chessboard)));
   } else {
     this->SetNextPositions(this->GetNextPositions(chessboard));
   }

ChessPieces/ChessPiece.hpp

@@ -14,6 +14,8 @@ class ChessPiece {
     ChessPieceColor _color;
     std::vector<ChessPiecePosition> _positions;
     std::set<ChessPiecePosition> _positions_next;
+    std::set<ChessPiecePosition> GetProtectivePositions(Chessboard* chessboard, std::set<ChessPiecePosition> positions);
+    bool IsProtective(Chessboard* chessboard);
 
   protected:
     char _char = '\0';
@@ -46,7 +48,6 @@ class ChessPiece {
     bool IsKing();
     bool IsKnight();
     bool IsPawn();
-    bool IsProtective(Chessboard* chessboard);
     bool IsQueen();
     bool IsRook();
     void SetPosition(ChessPiecePosition position);

ChessPieces/ChessPieceMove.cpp

@@ -0,0 +1,163 @@
+#include "../ChessPieces/ChessPieceMove.hpp"
+
+/**
+ * Creates a new move of a chess piece that uses the short algebraic notation.
+ * @param move The move that uses the short algebraic notation.
+ */
+ChessPieceMove::ChessPieceMove(std::string move) {
+  move = this->Normalize(move);
+
+  if (this->IsValidShortNotation(move)) {
+    this->_move = move;
+    this->ParseShortNotation();
+  } else {
+    throw std::invalid_argument("invalid move notation");
+  }
+}
+
+/**
+ * Status whether the move is a valid move that uses the short algebraic notation.
+ * @return Status whether the move is a valid move that uses the short algebraic notation.
+ */
+bool ChessPieceMove::IsValidShortNotation(std::string move) {
+  if (move.empty()) {
+    return std::regex_match(this->_move, this->_notation);
+  } else {
+    return std::regex_match(move, this->_notation);
+  }
+}
+
+/**
+ * Normalizes the move which, if valid, can then be parsed.
+ * @param move The move to be normalized.
+ * @return The normalized move which, if valid, can then be parsed.
+ */
+std::string ChessPieceMove::Normalize(std::string move) {
+  std::replace(move.begin(), move.end(), 'O', '0'); // castling: portable game notation to algebraic notation
+  std::replace(move.begin(), move.end(), 'S', 'N'); // german notation to english notation (knight)
+  std::replace(move.begin(), move.end(), 'L', 'B'); // german notation to english notation (bishop)
+  std::replace(move.begin(), move.end(), 'T', 'R'); // german notation to english notation (queen)
+  return move;
+}
+
+/**
+ * Parses a move that uses the short algebraic notation.
+ */
+void ChessPieceMove::ParseShortNotation() {
+  std::smatch parts;
+  std::regex_search(this->_move, parts, this->_notation);
+  this->_chessPiece = parts[1].str();
+  this->_fromPositionFile = parts[2].str();
+  this->_fromPositionRank = parts[3].str();
+  this->_capture = parts[4].str();
+  this->_toPositionFile = parts[5].str();
+  this->_toPositionRank = parts[6].str();
+  this->_promotion = parts[7].str();
+  this->_castling = parts[8].str();
+  this->_draw = parts[9].str();
+  this->_additional = parts[10].str();
+}
+
+/**
+ * Gets the chess piece char of the move.
+ * @return The chess piece char of the move.
+ */
+char ChessPieceMove::GetChessPieceChar() {
+  return this->_chessPiece.empty() ? 'P' : this->_chessPiece[0];
+}
+
+/**
+ * Gets the file part of the source position.
+ * @return The file part of the source position.
+ */
+char ChessPieceMove::GetFromPositionFile() {
+  return this->_fromPositionFile.empty() ? '\0' : this->_fromPositionFile[0];
+}
+
+/**
+ * Gets the rank part of the source position.
+ * @return The rank part of the source position.
+ */
+int ChessPieceMove::GetFromPositionRank() {
+  return this->_fromPositionRank.empty() ? 0 : stoi(this->_fromPositionRank);
+}
+
+/**
+ * Gets the chess piece character of the promotion.
+ * @return The chess piece character of the promotion.
+ */
+char ChessPieceMove::GetPromotionChessPieceChar() {
+  return this->_promotion.empty() ? '\0' : this->_promotion[this->_promotion.length() - 1];
+}
+
+/**
+ * Gets the file part of the target position.
+ * @return The file part of the target position.
+ */
+char ChessPieceMove::GetToPositionFile() {
+  return this->_toPositionFile.empty() ? '\0' : this->_toPositionFile[0];
+}
+
+/**
+ * Gets the rank part of the target position.
+ * @return The rank part of the target position.
+ */
+int ChessPieceMove::GetToPositionRank() {
+  return this->_toPositionRank.empty() ? 0 : stoi(this->_toPositionRank);
+}
+
+/**
+ * Status whether the move is a move with capture.
+ * @return Status whether the move is a move with capture.
+ */
+bool ChessPieceMove::IsCapture() {
+  return this->_capture == "x" ? true : false;
+}
+
+/**
+ * Status whether the move results in a check.
+ * @return Status whether the move results in a check.
+ */
+bool ChessPieceMove::IsCheck() {
+  return this->_additional == "+";
+}
+
+/**
+ * Status whether the move results in a checkmate.
+ * @return Status whether the move results in a checkmate.
+ */
+bool ChessPieceMove::IsCheckmate() {
+  return this->_additional == "++" || this->_additional == "#";
+}
+
+/**
+ * Status whether the move is a offer for a draw.
+ * @return Status whether the move is a offer for a draw.
+ */
+bool ChessPieceMove::IsDrawOffer() {
+  return this->_draw == "(=)";
+}
+
+/**
+ * Status whether the move is an "en passant" by pawn.
+ * @return Status whether the move is an "en passant" by pawn.
+ */
+bool ChessPieceMove::IsEnPassant() {
+  return this->_additional == "e.p.";
+}
+
+/**
+ * Status whether the move is the long castling (castling queenside).
+ * @return Status whether the move is the long castling (castling queenside).
+ */
+bool ChessPieceMove::IsLongCastling() {
+  return this->_castling == "0-0-0";
+}
+
+/**
+ * Status whether the move is the short castling (castling kingside).
+ * @return Status whether the move is the short castling (castling kingside).
+ */
+bool ChessPieceMove::IsShortCastling() {
+  return this->_castling == "0-0";
+}

ChessPieces/ChessPieceMove.hpp

@@ -0,0 +1,41 @@
+#ifndef ChessPieceMove_H
+#define ChessPieceMove_H
+
+#include <regex>
+
+class ChessPieceMove {
+  private:
+    std::string _chessPiece;
+    std::string _fromPositionFile;
+    std::string _fromPositionRank;
+    std::string _capture;
+    std::string _toPositionFile;
+    std::string _toPositionRank;
+    std::string _promotion;
+    std::string _castling;
+    std::string _draw;
+    std::string _additional;
+    std::string _move;
+    const std::regex _notation = std::regex("^(?:([RNBQKP]?)([a-h]?)([1-8]?)(x?)([a-h])([1-8])((?:[=])?[QRBN])?|(0-0(?:-0)?)|(\\(=\\)))([+#!?]| e.p.)*$");
+    std::string Normalize(std::string move);
+    void ParseShortNotation();
+
+  public:
+    ChessPieceMove(std::string move);
+    bool IsValidShortNotation(std::string move = "");
+    char GetChessPieceChar();
+    char GetFromPositionFile();
+    int GetFromPositionRank();
+    bool IsCapture();
+    char GetToPositionFile();
+    int GetToPositionRank();
+    char GetPromotionChessPieceChar();
+    bool IsShortCastling();
+    bool IsLongCastling();
+    bool IsDrawOffer();
+    bool IsCheck();
+    bool IsCheckmate();
+    bool IsEnPassant();
+};
+
+#endif

ChessPieces/ChessPiecePosition.cpp

@@ -56,18 +56,18 @@ std::string ChessPiecePosition::GetDifference(ChessPiecePosition fromPosition, C
   } else {
     std::string difference;
 
-    if (toPosition.GetFile() < fromPosition.GetFile()) {
-      difference.append(std::string(1, ChessPiecePosition::_MOVE_LEFT) + std::to_string(fromPosition.GetFile() - toPosition.GetFile()));
-    } else if (toPosition.GetFile() > fromPosition.GetFile()) {
-      difference.append(std::string(1, ChessPiecePosition::_MOVE_RIGHT) + std::to_string(toPosition.GetFile() - fromPosition.GetFile()));
-    }
-
     if (toPosition.GetRank() < fromPosition.GetRank()) {
       difference.append(std::string(1, ChessPiecePosition::_MOVE_BOTTOM) + std::to_string(fromPosition.GetRank() - toPosition.GetRank()));
     } else if (toPosition.GetRank() > fromPosition.GetRank()) {
       difference.append(std::string(1, ChessPiecePosition::_MOVE_TOP) + std::to_string(toPosition.GetRank() - fromPosition.GetRank()));
     }
 
+    if (toPosition.GetFile() < fromPosition.GetFile()) {
+      difference.append(std::string(1, ChessPiecePosition::_MOVE_LEFT) + std::to_string(fromPosition.GetFile() - toPosition.GetFile()));
+    } else if (toPosition.GetFile() > fromPosition.GetFile()) {
+      difference.append(std::string(1, ChessPiecePosition::_MOVE_RIGHT) + std::to_string(toPosition.GetFile() - fromPosition.GetFile()));
+    }
+
     return difference;
   }
 }

ChessPieces/King.cpp

@@ -34,7 +34,33 @@ std::set<ChessPiecePosition> King::GetNextPositions(Chessboard* chessboard, std:
       ChessPieceColor opponentColor = (this->GetColor() == ChessPieceColor::Black) ? ChessPieceColor::White : ChessPieceColor::Black;
 
       if (chessboard->IsPositionUnderAttack(*nextPosition, opponentColor) == false) {
-        positions.insert(*nextPosition);
+        bool isUnderAttackAfterMove = false;
+
+        // Positions are ignored which are still under attack after the king has moved.
+        // There are fields under attack which are in the shadow of the king.
+        for (ChessPiece* chessPiece : chessboard->GetChessPieces()) {
+          if (chessPiece && chessPiece->GetColor() != this->GetColor()) {
+            if (chessPiece->GetNextPositions().count(this->GetPosition()) == 1) {
+              if (chessPiece->GetNextPositions(chessboard, {this->GetPosition(), *nextPosition}).count(*nextPosition) == 1) {
+                isUnderAttackAfterMove = true;
+                break;
+              }
+            } else if (chessPiece->IsKing()) {
+              for (std::string nextMove : {"T1", "T1L1", "T1R1", "R1", "L1", "B1", "B1L1", "B1R1"}) {
+                ChessPiecePosition* nextPositionKing = chessPiece->GetPosition().NextFromString(nextMove);
+
+                if (nextPositionKing && *nextPosition == *nextPositionKing) {
+                  isUnderAttackAfterMove = true;
+                  break;
+                }
+              }
+            }
+          }
+        }
+
+        if (isUnderAttackAfterMove == false) {
+          positions.insert(*nextPosition);
+        }
       }
     }
   }

ChessPieces/Pawn.cpp

@@ -21,148 +21,70 @@ std::set<ChessPiecePosition> Pawn::GetNextPositions(Chessboard* chessboard, std:
   std::set<ChessPiecePosition> positions;
   ChessPiecePosition currentPosition = this->GetPosition();
   ChessPiecePosition* nextPosition = &currentPosition;
+  std::vector<std::string> nextDiagonalPositions;
+  std::string moveDifferenceOpponent;
 
-  if (this->GetColor() == ChessPieceColor::Black) {
+  if (this->GetColor() == ChessPieceColor::White) {
+    nextDiagonalPositions = {"T1L1", "T1R1"};
+    moveDifferenceOpponent = "B2";
+  } else {
+    nextDiagonalPositions = {"B1L1", "B1R1"};
+    moveDifferenceOpponent = "T2";
+  }
 
-    // 3.7.1. The pawn may move forward to the square immediately in front of it on the same file, provided that this square is unoccupied.
-    // 3.7.2. On its first move the pawn may move as in 3.7.1 or alternatively it may advance two squares along the same file, provided that both squares are unoccupied.
-    for (int move = 1; move <= 2; move++) {
-      nextPosition = nextPosition->NextBottom();
+  std::string stepVertical = nextDiagonalPositions[0].substr(0, 2);
 
-      if (nextPosition) {
-        if (chessboard->IsEmptyField(nextPosition) == false) {
-          break;
-        }
-
-        if (move == 1) {
-          positions.insert(*nextPosition);
-        } else if (move == 2 && this->IsFirstMove()) {
-          positions.insert(*nextPosition);
-        }
-      } else {
+  // 3.7.1. The pawn may move forward to the square immediately in front of it on the same file, provided that this square is unoccupied.
+  // 3.7.2. On its first move the pawn may move as in 3.7.1 or alternatively it may advance two squares along the same file, provided that both squares are unoccupied.
+  for (int move = 1; move <= 2; move++) {
+    if (nextPosition = nextPosition->NextFromString(stepVertical)) {
+      if (chessboard->IsEmptyField(nextPosition) == false) {
         break;
       }
-    }
 
-    // 3.7.3. the pawn may move to a square occupied by an opponent's piece diagonally in front of it on an adjacent file, capturing that piece.
-    for (std::string move : {"B1L1", "B1R1"}) {
+      if (move == 1 || (move == 2 && this->IsFirstMove())) {
+        positions.insert(*nextPosition);
+      }
+    } else {
+      break;
+    }
+  }
+
+  // 3.7.3. the pawn may move to a square occupied by an opponent's piece diagonally in front of it on an adjacent file, capturing that piece.
+  for (std::string moveDiagonal : nextDiagonalPositions) {
+    nextPosition = &currentPosition;
+    nextPosition = nextPosition->NextFromString(moveDiagonal);
+
+    if (nextPosition && chessboard->IsEmptyField(nextPosition) == false) {
+      ChessPiece* chessPiece = chessboard->GetChessPiece(nextPosition);
+
+      if (chessPiece->GetColor() != this->GetColor()) {
+        positions.insert(*nextPosition);
+      }
+    }
+  }
+
+  // 3.7.3.1. A pawn occupying a square on the same rank as and on an adjacent file to an opponent's pawn which has just advanced two squares
+  // in one move from its original square may capture this opponent's pawn as though the latter had been moved only one square.
+  // 3.7.3.2. This capture is only legal on the move following this advance and is called an "en passant" capture.
+  if (chessboard->HasMoves()) {
+    std::pair<ChessPiecePosition, ChessPiecePosition> lastMovePositions = chessboard->GetLastMovePositions();
+    std::string moveDifference = ChessPiecePosition::GetDifference(lastMovePositions.first, lastMovePositions.second);
+
+    for (std::string nextDiagonalPosition : nextDiagonalPositions) {
       nextPosition = &currentPosition;
-      nextPosition = nextPosition->NextFromString(move);
+      std::string stepDiagonal = nextDiagonalPosition.substr(2, 2);
+      nextPosition = nextPosition->NextFromString(stepDiagonal);
 
       if (nextPosition && chessboard->IsEmptyField(nextPosition) == false) {
         ChessPiece* chessPiece = chessboard->GetChessPiece(nextPosition);
 
-        if (chessPiece->GetColor() != this->GetColor()) {
-          positions.insert(*nextPosition);
-        }
-      }
-    }
+        if (chessPiece->IsPawn() && chessPiece->GetColor() != this->GetColor()) {
+          if (chessPiece->GetNumberOfMoves() == 1 && moveDifference == moveDifferenceOpponent && chessPiece->GetPosition() == lastMovePositions.second) {
+            ChessPiecePosition* diagonalPosition = currentPosition.NextFromString(nextDiagonalPosition);
 
-    // 3.7.3.1. A pawn occupying a square on the same rank as and on an adjacent file to an opponent's pawn which has just advanced two squares
-    // in one move from its original square may capture this opponent's pawn as though the latter had been moved only one square.
-    // 3.7.3.2. This capture is only legal on the move following this advance and is called an "en passant" capture.
-    if (chessboard->GetCountMoves() > 0) {
-      std::pair<ChessPiecePosition, ChessPiecePosition> lastMove = chessboard->GetLastMove();
-      std::string moveDifference = ChessPiecePosition::GetDifference(lastMove.first, lastMove.second);
-      ChessPiecePosition* leftPosition = currentPosition.NextLeft();
-      ChessPiecePosition* rightPosition = currentPosition.NextRight();
-
-      if (leftPosition && chessboard->IsEmptyField(leftPosition) == false) {
-        ChessPiece* chessPiece = chessboard->GetChessPiece(leftPosition);
-
-        if (chessPiece->GetColor() != this->GetColor() && chessPiece->IsPawn()) {
-          if (chessPiece->GetNumberOfMoves() == 1 && moveDifference == "T2" && chessPiece->GetPosition() == lastMove.second) {
-            ChessPiecePosition* bottomLeftPosition = currentPosition.NextFromString("B1L1");
-
-            if (bottomLeftPosition && chessboard->IsEmptyField(bottomLeftPosition)) {
-              positions.insert(*bottomLeftPosition);
-            }
-          }
-        }
-      }
-
-      if (rightPosition && chessboard->IsEmptyField(rightPosition) == false) {
-        ChessPiece* chessPiece = chessboard->GetChessPiece(rightPosition);
-
-        if (chessPiece->GetColor() != this->GetColor() && chessPiece->IsPawn()) {
-          if (chessPiece->GetNumberOfMoves() == 1 && moveDifference == "T2" && chessPiece->GetPosition() == lastMove.second) {
-            ChessPiecePosition* bottomRightPosition = currentPosition.NextFromString("B1R1");
-
-            if (bottomRightPosition && chessboard->IsEmptyField(bottomRightPosition)) {
-              positions.insert(*bottomRightPosition);
-            }
-          }
-        }
-      }
-    }
-  } else if (this->GetColor() == ChessPieceColor::White) {
-
-    // 3.7.1. The pawn may move forward to the square immediately in front of it on the same file, provided that this square is unoccupied.
-    // 3.7.2. On its first move the pawn may move as in 3.7.1 or alternatively it may advance two squares along the same file, provided that both squares are unoccupied.
-    for (int move = 1; move <= 2; move++) {
-      nextPosition = nextPosition->NextTop();
-
-      if (nextPosition) {
-        if (chessboard->IsEmptyField(nextPosition) == false) {
-          break;
-        }
-
-        if (move == 1) {
-          positions.insert(*nextPosition);
-        } else if (move == 2 && this->IsFirstMove()) {
-          positions.insert(*nextPosition);
-        }
-      } else {
-        break;
-      }
-    }
-
-    // 3.7.3. the pawn may move to a square occupied by an opponent's piece diagonally in front of it on an adjacent file, capturing that piece.
-    for (std::string move : {"T1L1", "T1R1"}) {
-      nextPosition = &currentPosition;
-      nextPosition = nextPosition->NextFromString(move);
-
-      if (nextPosition && chessboard->IsEmptyField(nextPosition) == false) {
-        ChessPiece* chessPiece = chessboard->GetChessPiece(nextPosition);
-
-        if (chessPiece->GetColor() != this->GetColor()) {
-          positions.insert(*nextPosition);
-        }
-      }
-    }
-
-    // 3.7.3.1. A pawn occupying a square on the same rank as and on an adjacent file to an opponent's pawn which has just advanced two squares
-    // in one move from its original square may capture this opponent's pawn as though the latter had been moved only one square.
-    // 3.7.3.2. This capture is only legal on the move following this advance and is called an "en passant" capture.
-    if (chessboard->GetCountMoves() > 0) {
-      std::pair<ChessPiecePosition, ChessPiecePosition> lastMove = chessboard->GetLastMove();
-      std::string moveDifference = ChessPiecePosition::GetDifference(lastMove.first, lastMove.second);
-      ChessPiecePosition* leftPosition = currentPosition.NextLeft();
-      ChessPiecePosition* rightPosition = currentPosition.NextRight();
-
-      if (leftPosition && chessboard->IsEmptyField(leftPosition) == false) {
-        ChessPiece* chessPiece = chessboard->GetChessPiece(leftPosition);
-
-        if (chessPiece->GetColor() != this->GetColor() && chessPiece->IsPawn()) {
-          if (chessPiece->GetNumberOfMoves() == 1 && moveDifference == "B2" && chessPiece->GetPosition() == lastMove.second) {
-            ChessPiecePosition* topLeftPosition = currentPosition.NextFromString("T1L1");
-
-            if (topLeftPosition && chessboard->IsEmptyField(topLeftPosition)) {
-              positions.insert(*topLeftPosition);
-            }
-          }
-        }
-      }
-
-      if (rightPosition && chessboard->IsEmptyField(rightPosition) == false) {
-        ChessPiece* chessPiece = chessboard->GetChessPiece(rightPosition);
-
-        if (chessPiece->GetColor() != this->GetColor() && chessPiece->IsPawn()) {
-          if (chessPiece->GetNumberOfMoves() == 1 && moveDifference == "B2" && chessPiece->GetPosition() == lastMove.second) {
-            ChessPiecePosition* topRightPosition = currentPosition.NextFromString("T1R1");
-
-            if (topRightPosition && chessboard->IsEmptyField(topRightPosition)) {
-              positions.insert(*topRightPosition);
+            if (diagonalPosition && chessboard->IsEmptyField(diagonalPosition)) {
+              positions.insert(*diagonalPosition);
             }
           }
         }

Chessboard/Chessboard.cpp

@@ -1,10 +1,251 @@
 #include "../Chessboard/Chessboard.hpp"
+#include "../ChessPieces/Rook.hpp"
+#include "../ChessPieces/Queen.hpp"
+#include "../ChessPieces/Bishop.hpp"
+#include "../ChessPieces/Knight.hpp"
+#include "../ChessPieces/ChessPieceMove.hpp"
 #include "../ChessPieces/ChessPiece.hpp"
 
+/**
+ * Gets the current player.
+ * @return A pointer to the current player.
+ */
+Player* Chessboard::GetCurrentPlayer() {
+  return this->currentPlayer;
+}
+
+/**
+ * Gets the history of all moves.
+ * @return The history of all moves.
+ */
+std::vector<std::string> Chessboard::GetHistoryMoves() {
+  return this->_historyMoves;
+}
+
+/**
+ * Gets the history of all positions.
+ * @return The history of all positions.
+ */
+std::vector<std::pair<ChessPiecePosition, ChessPiecePosition>> Chessboard::GetHistoryPositions() {
+  return this->_historyPositions;
+}
+
+/**
+ * Gets the opponent player.
+ * @return A pointer to the opponent player.
+ */
+Player* Chessboard::GetOpponentPlayer() {
+  if (this->GetCurrentPlayer()->GetColor() == ChessPieceColor::Black) {
+    return this->GetPlayer(ChessPieceColor::White);
+  } else {
+    return this->GetPlayer(ChessPieceColor::Black);
+  }
+}
+
+/**
+ * Gets a player by the specified color.
+ * @return Player* A pointer to the player with the specified color.
+ */
+Player* Chessboard::GetPlayer(ChessPieceColor color) {
+  if (color == ChessPieceColor::Black) {
+    return std::get<ChessPieceColor::Black>(this->players);
+  } else {
+    return std::get<ChessPieceColor::White>(this->players);
+  }
+}
+
+/**
+ * Status whether moves have already been made.
+ * @return Status whether moves have already been made.
+ */
+bool Chessboard::HasMoves() {
+  return this->_historyMoves.size() > 0;
+}
+
+/**
+ * Status whether the king of the current player is in checkmate.
+ * @return Status whether the king of the current player is in checkmate.
+ */
+bool Chessboard::IsCheckmate() {
+  int numberOfAttackers = 0;
+
+  if (this->IsInCheck() == false) {
+    return false;
+  }
+
+  ChessPiece* chessPieceKing = this->GetChessPieceKing(this->GetCurrentPlayer()->GetColor());
+
+  if (chessPieceKing == nullptr) {
+    throw std::domain_error("king is missing");
+  }
+
+  // it is not checkmate if the king can move to another position.
+  if (chessPieceKing->GetNextPositions().size() > 0) {
+    return false;
+  }
+
+  for (ChessPiece* chessPieceOpponent : this->GetChessPieces()) {
+    if (chessPieceOpponent->GetColor() == this->GetOpponentPlayer()->GetColor()) {
+      if (chessPieceOpponent->GetNextPositions().count(chessPieceKing->GetPosition()) == 1) {
+        bool isDefensibleAttack = false;
+        numberOfAttackers++;
+
+        // the attacker can be removed directly by another chess piece.
+        for (ChessPiece* chessPieceCurrent : this->GetChessPieces()) {
+          if (chessPieceCurrent->GetColor() == this->GetCurrentPlayer()->GetColor()) {
+            if (chessPieceCurrent->GetNextPositions().count(chessPieceOpponent->GetPosition()) == 1) {
+              isDefensibleAttack = true;
+              break;
+            }
+          }
+        }
+
+        // the attacker is defensible.
+        if (isDefensibleAttack == true) {
+          std::cout << isDefensibleAttack << std::endl;
+          continue;
+        }
+
+        // check if a chess piece can move between the attacker and king.
+        std::string step = ChessPiecePosition::GetStep(chessPieceOpponent->GetPosition(), chessPieceKing->GetPosition());
+
+        // there is no direct way between attacker and king. so the attacker is the knight.
+        // in this case we can not defend the attack by moving a chess piece between attacker and king.
+        if (step.empty()) {
+          return true;
+        }
+
+        ChessPiecePosition currentPosition = chessPieceOpponent->GetPosition();
+        ChessPiecePosition* nextPosition = &currentPosition;
+
+        while (nextPosition = nextPosition->NextFromString(step)) {
+          if (*nextPosition == chessPieceKing->GetPosition()) break;
+
+          for (ChessPiece* chessPieceCurrent : this->GetChessPieces()) {
+            if (chessPieceCurrent->GetColor() == this->GetCurrentPlayer()->GetColor()) {
+              if (chessPieceCurrent->GetNextPositions().count(*nextPosition) == 1) {
+                isDefensibleAttack = true;
+                break;
+              }
+            }
+          }
+        }
+
+        if (isDefensibleAttack == false) {
+          return true;
+        }
+      }
+    }
+  }
+
+  return numberOfAttackers > 1;
+}
+
+/**
+ * Status whether the king of the current player is in check.
+ * @return Status whether the king of the current player is in check.
+ */
+bool Chessboard::IsInCheck() {
+  ChessPieceColor currentPlayerColor = this->GetCurrentPlayer()->GetColor();
+  ChessPiece* chessPieceKing = this->GetChessPieceKing(currentPlayerColor);
+
+  if (chessPieceKing == nullptr) {
+    throw std::domain_error("king is missing");
+  }
+
+  // 3.9    The king in check:
+  // 3.9.1    The king is said to be "in check" if it is attacked by one or more of the opponent's pieces, even if such pieces are
+  //          constrained from moving to the square occupied by the king because they would then leave or place their own king in check.
+  // 3.9.2    No piece can be moved that will either expose the king of the same colour to check or leave that king in check.
+  for (std::pair<ChessPiecePosition, ChessPiece*> field : this->chessboard) {
+    if (field.second->GetColor() == this->GetOpponentPlayer()->GetColor()) {
+      if (field.second->GetNextPositions().count(chessPieceKing->GetPosition()) == 1) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+/**
+ * Status whether the match ends with a draw because of stalemate.
+ * @return Status whether the match ends with a draw because of stalemate.
+ */
+bool Chessboard::IsStalemate() {
+  ChessPieceColor currentPlayerColor = this->GetCurrentPlayer()->GetColor();
+  ChessPieceColor opponentPlayerColor = this->GetOpponentPlayer()->GetColor();
+  ChessPiece* chessPieceKing = this->GetChessPieceKing(currentPlayerColor);
+
+  if (chessPieceKing == nullptr) {
+    throw std::domain_error("king is missing");
+  }
+
+  // 5.2.1  The game is drawn when the player to move has no legal move and his/her king is not in check.
+  //        The game is said to end in "stalemate". This immediately ends the game.
+  for (std::pair<ChessPiecePosition, ChessPiece*> field : this->chessboard) {
+    if (field.second->GetColor() == currentPlayerColor) {
+      if (field.second->GetNextPositions().size() > 0) {
+        return false;
+      }
+    }
+  }
+
+  if (this->IsInCheck()) {
+    return false;
+  }
+
+  return true;
+}
+
+/**
+ * Sets a chess piece on the chessboard.
+ * If there is already a chess piece on the field, the chess piece will be deleted.
+ * @param chesspiece A pointer to the chess piece which is to be set.
+ */
 void Chessboard::SetChessPiece(ChessPiece* chesspiece) {
   this->chessboard[chesspiece->GetPosition()] = chesspiece;
 }
 
+/**
+ * Sets the move to the history.
+ * @param move The move to be added to the history.
+ */
+void Chessboard::SetToHistory(std::string move) {
+  this->_historyMoves.push_back(move);
+}
+
+/**
+ * Sets the source and target position to the history.
+ * @param fromPosition The source position to be added to the history.
+ * @param toPosition The target position to be added to the history.
+ */
+void Chessboard::SetToHistory(ChessPiecePosition fromPosition, ChessPiecePosition toPosition) {
+  this->_historyPositions.push_back({fromPosition, toPosition});
+}
+
+/**
+ * Switches the current player.
+ */
+void Chessboard::SwitchCurrentPlayer() {
+  this->currentPlayer = this->GetOpponentPlayer();
+}
+
+
+
+
+
+
+
+
+void Chessboard::RemoveChessPiece(ChessPiecePosition position) {
+  if (this->chessboard.count(position) == 1) {
+    delete this->chessboard[position];
+    this->chessboard.erase(position);
+  }
+}
+
+
 bool Chessboard::IsEmptyField(ChessPiecePosition* position) {
   return (this->chessboard.count(*position) == 0);
 }
@@ -15,41 +256,212 @@ ChessPiece* Chessboard::GetChessPiece(ChessPiecePosition* position) {
 
 
 
-void Chessboard::MoveChessPiece(std::string move) {
-  if (move.length() == 5) {
-    ChessPiecePosition* fromPosition = new ChessPiecePosition(move.substr(0, 2));
-    ChessPiecePosition* toPosition = new ChessPiecePosition(move.substr(3, 2));
+bool Chessboard::MoveCastling(ChessPieceColor color, bool shortCastling) {
+  ChessPiecePosition fromPositionKing = (color == ChessPieceColor::White) ? ChessPiecePosition("E1") : ChessPiecePosition("E8");
+  ChessPiecePosition fromPositionRook = (color == ChessPieceColor::White) ? ChessPiecePosition(shortCastling ? "H1" : "A1") : ChessPiecePosition(shortCastling ? "H8" : "A8");
+  ChessPiecePosition toPositionKing = (color == ChessPieceColor::White) ? ChessPiecePosition(shortCastling ? "G1" : "C1") : ChessPiecePosition(shortCastling ? "G8" : "C8");
+  ChessPiecePosition toPositionRook = (color == ChessPieceColor::White) ? ChessPiecePosition(shortCastling ? "F1" : "D1") : ChessPiecePosition(shortCastling ? "F8" : "D8");
 
-    ChessPiece* piece = this->GetChessPiece(fromPosition);
+  ChessPiece* chessPieceRook = this->GetChessPiece(&fromPositionRook);
+  ChessPiece* chessPieceKing = this->GetChessPiece(&fromPositionKing);
 
-    if (piece->GetColor() != this->GetCurrentPlayer()->GetColor()) {
-      return; // wrong player
-    }
+  if (chessPieceKing == nullptr || chessPieceRook == nullptr) {
+    return false;
+  }
 
-    if (piece->GetNextPositions().count(*toPosition) == 1) {
-      this->chessboard[*toPosition] = this->chessboard[*fromPosition];
-      this->chessboard.erase(*fromPosition);
-      piece->SetPosition(*toPosition);
-      this->SetToHistory(*fromPosition, *toPosition);
+  if (chessPieceKing->IsKing() == false || chessPieceRook->IsRook() == false) {
+    return false;
+  }
+
+  if (chessPieceKing->IsFirstMove() == false || chessPieceRook->IsFirstMove() == false) {
+    return false;
+  }
+
+  std::string step = ChessPiecePosition::GetStep(chessPieceKing->GetPosition(), toPositionKing);
+  ChessPiecePosition currentPosition = chessPieceKing->GetPosition();
+  ChessPiecePosition* nextPosition = &currentPosition;
+  while (nextPosition = nextPosition->NextFromString(step)) {
+    if (this->IsEmptyField(nextPosition)) {
+      for (std::pair<ChessPiecePosition, ChessPiece*> field : this->chessboard) {
+        if (field.second->GetColor() != color) {
+          if (field.second->GetNextPositions().count(*nextPosition) == 0) {
+            continue;
+          } else {
+            return false;
+          }
+        }
+      }
+      if (nextPosition->ToString() == toPositionKing.ToString()) {
+        break;
+      }
     } else {
-      return; // wrong or invalid move
+      return false;
     }
   }
 
+  this->chessboard[toPositionKing] = chessPieceKing;
+  this->chessboard.erase(chessPieceKing->GetPosition());
+  this->SetToHistory(chessPieceKing->GetPosition(), toPositionKing);
+  chessPieceKing->SetPosition(toPositionKing);
+  this->chessboard[toPositionRook] = chessPieceRook;
+  this->chessboard.erase(chessPieceRook->GetPosition());
+  this->SetToHistory(chessPieceRook->GetPosition(), toPositionRook);
+  chessPieceRook->SetPosition(toPositionRook);
+  return true;
+}
+
+void Chessboard::MoveChessPiece(std::string move) {
+  ChessPieceMove chessPieceMove = ChessPieceMove(move);
+
+  if (chessPieceMove.IsValidShortNotation() == false) {
+    return;
+  }
+
+  if (chessPieceMove.IsShortCastling()) {
+    this->MoveCastling(this->GetCurrentPlayer()->GetColor(), true);
+  } else if (chessPieceMove.IsLongCastling()) {
+    this->MoveCastling(this->GetCurrentPlayer()->GetColor(), false);
+  } else if (chessPieceMove.IsDrawOffer()) {
+    // Remis
+  } else {
+    ChessPiece* chessPiece = nullptr;
+    ChessPiecePosition toChessPiecePosition = ChessPiecePosition(chessPieceMove.GetToPositionFile(), chessPieceMove.GetToPositionRank());
+    char fromPositionFile = chessPieceMove.GetFromPositionFile();
+    int fromPositionRank = chessPieceMove.GetFromPositionRank();
+
+    for (std::pair<ChessPiecePosition, ChessPiece*> field : this->chessboard) {
+      if (field.second->GetColor() == this->GetCurrentPlayer()->GetColor()) {
+        if (field.second->GetChar() == chessPieceMove.GetChessPieceChar() && field.second->GetNextPositions().count(toChessPiecePosition) == 1) {
+
+          if (fromPositionFile >= 'a' && fromPositionFile <= 'h') {
+            if (field.second->GetPosition().GetFile() == std::toupper(fromPositionFile)) {
+              chessPiece = field.second;
+              break;
+            } else {
+              continue;
+            }
+          }
+
+          if (fromPositionRank >= 1 && fromPositionRank <= 8) {
+            if (field.second->GetPosition().GetRank() == fromPositionRank) {
+              chessPiece = field.second;
+              break;
+            } else {
+              continue;
+            }
+          }
+
+          chessPiece = field.second;
+          break;
+        }
+      }
+    }
+
+    if (chessPiece) {
+      if (this->IsEmptyField(&toChessPiecePosition) == false) {
+        this->RemoveChessPiece(toChessPiecePosition);
+        this->chessboard[toChessPiecePosition] = this->chessboard[chessPiece->GetPosition()];
+        this->chessboard.erase(chessPiece->GetPosition());
+        this->SetToHistory(chessPiece->GetPosition(), toChessPiecePosition);
+        chessPiece->SetPosition(toChessPiecePosition);
+      } else {
+        if (chessPiece->IsPawn()) {
+          if (chessPiece->GetColor() == ChessPieceColor::White) {
+            std::string difference = ChessPiecePosition::GetDifference(chessPiece->GetPosition(), toChessPiecePosition);
+
+            if (difference == "T1L1" || difference == "T1R1") {
+              ChessPiecePosition currentPosition = toChessPiecePosition;
+              ChessPiecePosition* nextPosition = &currentPosition;
+
+              if (nextPosition = nextPosition->NextBottom()) {
+                if (this->IsEmptyField(nextPosition) == false) {
+                  ChessPiece* chessPieceRemove = this->GetChessPiece(nextPosition);
+
+                  if (chessPieceRemove->GetColor() != chessPiece->GetColor() && chessPieceRemove->IsPawn()) {
+                    this->chessboard[toChessPiecePosition] = this->chessboard[chessPiece->GetPosition()];
+                    this->chessboard.erase(chessPiece->GetPosition());
+                    this->SetToHistory(chessPiece->GetPosition(), toChessPiecePosition);
+                    chessPiece->SetPosition(toChessPiecePosition);
+                    this->RemoveChessPiece(chessPieceRemove->GetPosition());
+                  }
+                }
+              }
+            } else {
+              this->chessboard[toChessPiecePosition] = this->chessboard[chessPiece->GetPosition()];
+              this->chessboard.erase(chessPiece->GetPosition());
+              this->SetToHistory(chessPiece->GetPosition(), toChessPiecePosition);
+              chessPiece->SetPosition(toChessPiecePosition);
+            }
+          } else if (chessPiece->GetColor() == ChessPieceColor::Black) {
+            std::string difference = ChessPiecePosition::GetDifference(chessPiece->GetPosition(), toChessPiecePosition);
+
+            if (difference == "B1L1" || difference == "B1R1") {
+              ChessPiecePosition currentPosition = toChessPiecePosition;
+              ChessPiecePosition* nextPosition = &currentPosition;
+
+              if (nextPosition = nextPosition->NextTop()) {
+                if (this->IsEmptyField(nextPosition) == false) {
+                  ChessPiece* chessPieceRemove = this->GetChessPiece(nextPosition);
+
+                  if (chessPieceRemove->GetColor() != chessPiece->GetColor() && chessPieceRemove->IsPawn()) {
+                    this->chessboard[toChessPiecePosition] = this->chessboard[chessPiece->GetPosition()];
+                    this->chessboard.erase(chessPiece->GetPosition());
+                    this->SetToHistory(chessPiece->GetPosition(), toChessPiecePosition);
+                    chessPiece->SetPosition(toChessPiecePosition);
+                    this->RemoveChessPiece(chessPieceRemove->GetPosition());
+                  }
+                }
+              }
+            } else {
+              this->chessboard[toChessPiecePosition] = this->chessboard[chessPiece->GetPosition()];
+              this->chessboard.erase(chessPiece->GetPosition());
+              this->SetToHistory(chessPiece->GetPosition(), toChessPiecePosition);
+              chessPiece->SetPosition(toChessPiecePosition);
+            }
+          }
+        } else {
+          this->chessboard[toChessPiecePosition] = this->chessboard[chessPiece->GetPosition()];
+          this->chessboard.erase(chessPiece->GetPosition());
+          this->SetToHistory(chessPiece->GetPosition(), toChessPiecePosition);
+          chessPiece->SetPosition(toChessPiecePosition);
+        }
+      }
+
+      if (chessPieceMove.GetPromotionChessPieceChar() != '\0') {
+        ChessPieceColor color = chessPiece->GetColor();
+        this->RemoveChessPiece(toChessPiecePosition);
+
+        switch (chessPieceMove.GetPromotionChessPieceChar()) {
+          case 'R':
+            this->chessboard[toChessPiecePosition] = new Rook(color, toChessPiecePosition);
+            break;
+          case 'B':
+            this->chessboard[toChessPiecePosition] = new Bishop(color, toChessPiecePosition);
+            break;
+          case 'N':
+            this->chessboard[toChessPiecePosition] = new Knight(color, toChessPiecePosition);
+            break;
+          case 'Q':
+            this->chessboard[toChessPiecePosition] = new Queen(color, toChessPiecePosition);
+            break;
+        }
+      }
+    }
+  }
+
+  this->SetToHistory(move);
   this->UpdateChessPieces();
   this->SwitchCurrentPlayer();
 }
 
-void Chessboard::SetToHistory(ChessPiecePosition fromPosition, ChessPiecePosition toPosition) {
-  this->history.push_back({fromPosition, toPosition});
-}
+
 
 int Chessboard::GetCountMoves() {
-  return this->history.size();
+  return this->_historyPositions.size();
 }
 
-std::pair<ChessPiecePosition, ChessPiecePosition> Chessboard::GetLastMove() {
-  return this->history.back();
+std::pair<ChessPiecePosition, ChessPiecePosition> Chessboard::GetLastMovePositions() {
+  return this->_historyPositions.back();
 }
 
 std::vector<ChessPiece*> Chessboard::GetChessPieces() {
@@ -62,157 +474,9 @@ std::vector<ChessPiece*> Chessboard::GetChessPieces() {
   return chessPieces;
 }
 
-bool Chessboard::IsCheck() {
-  ChessPiece* chessPieceKing = this->GetChessPieceKing(this->GetCurrentPlayer()->GetColor());
-
-  for (std::pair<ChessPiecePosition, ChessPiece*> field : this->chessboard) {
-    if (field.second->GetColor() == this->GetOpponentPlayer()->GetColor()) {
-      if (field.second->GetNextPositions().count(chessPieceKing->GetPosition()) == 1) {
-        return true;
-      }
-    }
-  }
-
-  return false;
-}
-
-bool Chessboard::IsCheckmate() {
-
-  if (this->IsCheck() == false) {
-    return false;
-  }
-
-  ChessPiece* chessPieceKing = this->GetChessPieceKing(this->GetCurrentPlayer()->GetColor());
-
-  if (chessPieceKing->GetNextPositions().size() > 0) {
-    return false;
-  }
 
 
-  int cntAttacker = 0;
 
-  for (ChessPiece* chessPieceOpponent : this->GetChessPieces()) {
-    if (chessPieceOpponent->GetColor() == this->GetOpponentPlayer()->GetColor()) {
-      if (chessPieceOpponent->GetNextPositions().count(chessPieceKing->GetPosition()) == 1) { // Is an attacker
-        cntAttacker++;
-
-        bool deniable = false;
-
-        // remove attacker
-        for (ChessPiece* chessPieceCurrent : this->GetChessPieces()) {
-          if (chessPieceCurrent->GetColor() == this->GetCurrentPlayer()->GetColor()) {
-            if (chessPieceCurrent->GetNextPositions().count(chessPieceOpponent->GetPosition()) == 1) {
-              deniable = true; // blocked attack because current player can remove attacker
-              break;
-            }
-          }
-        }
-
-        if (deniable == false) {
-          return true;
-        }
-
-        // move between attacker and king
-        // this is not possible for pawn, knight and king because they beat on next field.
-
-        std::string step = ChessPiecePosition::GetStep(chessPieceOpponent->GetPosition(), chessPieceKing->GetPosition());
-
-        ChessPiecePosition currentPosition = chessPieceOpponent->GetPosition();
-        ChessPiecePosition* nextPosition = &currentPosition;
-        deniable = false;
-
-        while (nextPosition = nextPosition->NextFromString(step)) {
-          for (ChessPiece* chessPieceCurrent : this->GetChessPieces()) {
-            if (chessPieceCurrent->GetColor() == this->GetCurrentPlayer()->GetColor()) {
-              if (chessPieceCurrent->GetNextPositions().count(*nextPosition) == 1) {
-                deniable = true; // blocked attack because current player can block between attacker and king
-                break;
-              }
-            }
-          }
-        }
-
-         if (deniable == false) {
-          return true;
-        }
-      }
-    }
-  }
-
-  if (cntAttacker > 1) {
-    return true;
-  }
-
-  return false;
-}
-
-bool Chessboard::IsStalemate() {
-  ChessPieceColor currentColor = this->GetCurrentPlayer()->GetColor();
-  ChessPieceColor opponentColor = this->GetOpponentPlayer()->GetColor();
-  ChessPiece* chessPieceKing;
-
-  for (std::pair<ChessPiecePosition, ChessPiece*> field : this->chessboard) {
-    if (field.second->IsKing() && field.second->GetColor() == currentColor) {
-      chessPieceKing = field.second;
-      break;
-    }
-  }
-
-  // Der König hat aber auch keine validen Züge mehr.
-  if (chessPieceKing->GetNextPositions().size() > 0) {
-    return false;
-  }
-
-  // Man hat selbst keine Figuren mehr welche noch ziehen könnten.
-  for (std::pair<ChessPiecePosition, ChessPiece*> field : this->chessboard) {
-    if (field.second->GetColor() == currentColor) {
-      if (field.second->GetNextPositions().size() > 0) {
-        return false;
-      }
-    }
-  }
-
-  // König wird nicht direkt attackiert.
-  for (std::pair<ChessPiecePosition, ChessPiece*> field : this->chessboard) {
-    if (field.second->GetColor() == opponentColor) {
-      if (field.second->GetNextPositions().count(chessPieceKing->GetPosition()) == 1) {
-        return false;
-      }
-    }
-  }
-
-  return true;
-}
-
-/**
- * Get the current player.
- */
-Player* Chessboard::GetCurrentPlayer() {
-  return this->currentPlayer;
-}
-
-/**
- * Get the opponent player.
- */
-Player* Chessboard::GetOpponentPlayer() {
-  if (this->GetCurrentPlayer()->GetColor() == ChessPieceColor::Black) {
-    return this->GetPlayer(ChessPieceColor::White);
-  } else {
-    return this->GetPlayer(ChessPieceColor::Black);
-  }
-}
-
-/**
- * Get a player by color.
- * @return Player* The player who is associated with the given color.
- */
-Player* Chessboard::GetPlayer(ChessPieceColor color) {
-  if (color == ChessPieceColor::Black) {
-    return std::get<ChessPieceColor::Black>(this->players);
-  } else {
-    return std::get<ChessPieceColor::White>(this->players);
-  }
-}
 
 /**
  * Set the players to the chessboard.
@@ -236,16 +500,7 @@ void Chessboard::SetPlayers(Player* playerA, Player* playerB) {
   this->currentPlayer = this->GetPlayer(ChessPieceColor::White);
 }
 
-/**
- * Switch the current player.
- */
-void Chessboard::SwitchCurrentPlayer() {
-  if (this->GetCurrentPlayer()->GetColor() == ChessPieceColor::White) {
-    this->currentPlayer = this->GetPlayer(ChessPieceColor::Black);
-  } else {
-    this->currentPlayer = this->GetPlayer(ChessPieceColor::White);
-  }
-}
+
 
 /**
  * Update the next positions of all chess pieces.
@@ -268,15 +523,31 @@ void Chessboard::UpdateChessPieces() {
  */
 bool Chessboard::IsPositionUnderAttack(ChessPiecePosition position, ChessPieceColor color) {
   for (std::pair<ChessPiecePosition, ChessPiece*> field : this->chessboard) {
-    if (field.second->GetColor() == color && field.second->GetNextPositions().count(position) == 1) {
+    if (field.second->IsPawn() == false && field.second->GetColor() == color && field.second->GetNextPositions().count(position) == 1) {
       return true;
     }
   }
 
+  for (std::pair<ChessPiecePosition, ChessPiece*> field : this->chessboard) {
+    if (field.second->IsPawn() && field.second->GetColor() == color) {
+      std::string difference = ChessPiecePosition::GetDifference(field.second->GetPosition(), position);
+      if (color == ChessPieceColor::White && (difference == "T1L1" || difference == "T1R1")) {
+        return true;
+      } else if (color == ChessPieceColor::Black && (difference == "B1L1" || difference == "B1R1")) {
+        return true;
+      } else {
+        continue;
+      }
+    }
+  }
+
   return false;
 }
 
 Chessboard::~Chessboard() {
+  delete this->players.first;
+  delete this->players.second;
+
   for (std::pair<ChessPiecePosition, ChessPiece*> field : this->chessboard) {
     delete field.second;
   }

Chessboard/Chessboard.hpp

@@ -4,6 +4,7 @@
 #include <iostream>
 #include <map>
 #include <random>
+#include <regex>
 #include <string>
 #include <utility>
 #include <vector>
@@ -15,24 +16,31 @@ class ChessPiece;
 
 class Chessboard {
   private:
+    std::vector<std::string> _historyMoves;
+    std::vector<std::pair<ChessPiecePosition, ChessPiecePosition>> _historyPositions;
     std::map<ChessPiecePosition, ChessPiece*> chessboard;
-    std::vector<std::pair<ChessPiecePosition, ChessPiecePosition>> history;
     std::pair<Player*, Player*> players;
     Player* currentPlayer;
+    void RemoveChessPiece(ChessPiecePosition position);
 
   public:
     ~Chessboard();
+    std::vector<std::string> GetHistoryMoves();
+    std::vector<std::pair<ChessPiecePosition, ChessPiecePosition>> GetHistoryPositions();
     void SetChessPiece(ChessPiece* chesspiece);
     bool IsEmptyField(ChessPiecePosition* position);
     ChessPiece* GetChessPiece(ChessPiecePosition* position);
     std::vector<ChessPiece*> GetChessPieces();
     void UpdateChessPieces();
     void MoveChessPiece(std::string move);
+    bool MoveCastling(ChessPieceColor color, bool shortCastling);
+    void SetToHistory(std::string move);
     void SetToHistory(ChessPiecePosition fromPosition, ChessPiecePosition toPosition);
     int GetCountMoves();
-    std::pair<ChessPiecePosition, ChessPiecePosition> GetLastMove();
+    bool HasMoves();
+    std::pair<ChessPiecePosition, ChessPiecePosition> GetLastMovePositions();
     bool IsCheckmate();
-    bool IsCheck();
+    bool IsInCheck();
     bool IsStalemate();
     bool IsPositionUnderAttack(ChessPiecePosition position, ChessPieceColor color);
     Player* GetCurrentPlayer();

README.md

@@ -92,18 +92,30 @@
 
 ## ToDo
 - Speicherfunktion
-- Schachnotation (Lange)
 - Menü (ASCII Art of TurboSchach)
   - Startmenü
   - Spielmenü mit Historie, Kommand
   - Plattformunabhängiges CMD clearing vor dem Zeichnen
-- Spezialbewegung (Rochade, Umwandlung, En passant)
 
-## Build
+## Kompilieren und Ausführen
+Um TurboSchach kompilieren zu können wird mindestens C++ 17 benötigt.
+
+### Windows
+
 ```
-g++ -o chess.exe main.cpp ChessPieces/*.cpp Chessboard/*.cpp Player/*.cpp
+g++ -std=c++17 -o chess.exe main.cpp ChessPieces/*.cpp Chessboard/*.cpp Player/*.cpp
+./chess.exe
 ```
 
-## Voraussetzungen
+### Linux und MacOS
 
-- C++ 17
+```
+# compile the project
+make
+
+# run the project
+make run
+
+# remove all output files
+make clean
+```

main.cpp

@@ -1,4 +1,7 @@
+#ifdef _WIN32
 #include <windows.h>
+#endif
+#include <fstream>
 #include "Player/Player.hpp"
 #include "ChessPieces/Knight.hpp"
 #include "ChessPieces/Bishop.hpp"
@@ -13,7 +16,9 @@
 #include "Chessboard/ChessboardVisualizerGraphic.hpp"
 
 int main(int argc, char* argv[]) {
+    #ifdef _WIN32
     SetConsoleOutputCP(CP_UTF8);
+    #endif
 
     std::cout << "Spieler A: ";
     std::string namePlayerA;
@@ -69,13 +74,68 @@ int main(int argc, char* argv[]) {
 
     //ChessboardVisualizerText* visualizer = new ChessboardVisualizerText();
     ChessboardVisualizerGraphic* visualizer = new ChessboardVisualizerGraphic();
+    visualizer->Draw(&chessboard);
+
+    // chessgames.com/1649097
+    // https://www.chessgames.com/perl/chessgame?gid=1649097
+    //
+    //1258478 - Stalemate
+    //std::ifstream input("C:\\Users\\Sebastian Brosch\\Desktop\\2767717.pgn");
+    // std::ifstream input("C:\\Users\\Sebastian Brosch\\Desktop\\1258478.pgn");
+    // //std::ifstream input("2767713.pgn");
+    // //std::ifstream input("1482706.pgn");
+    // //std::ifstream input("1693032.pgn");
+    // //std::ifstream input("1272702.pgn");
+    // //std::ifstream input("2446807.pgn");
+    // //std::ifstream input("1884783.pgn");
+    // std::regex moves_regex("([0-9]+.)(?:\n| )?([A-Za-z][A-Za-z0-9+#-=]+)(?:\n| )?([A-Za-z][A-Za-z0-9+#-]+)?");
+    // std::smatch moves_matches;
+    // std::string moves_content;
+    // for (std::string line; getline(input, line);) {
+    //   if (line[0] == '[') {
+    //     // Info
+    //   } else {
+    //     moves_content.append((moves_content == "") ? "" : " ").append(line);
+    //   }
+    // }
+    // std::regex_search(moves_content, moves_matches, moves_regex);
+    // std::vector<std::string> moves;
+
+    // for(std::sregex_iterator i = std::sregex_iterator(moves_content.begin(), moves_content.end(), moves_regex); i != std::sregex_iterator(); ++i) {
+    //   std::smatch m = *i;
+    //   if (m[2].str() != "") {
+    //     moves.push_back(m[2].str());
+    //   }
+    //   if (m[3].str() != "") {
+    //     moves.push_back(m[3].str());
+    //   }
+    // }
+    // int move_count = 0;
+    // while (chessboard.IsCheckmate() == false) {
+    //   move_count++;
+    //   std::string move = moves.front();
+    //   moves.erase(moves.begin());
+    //   chessboard.MoveChessPiece(move);
+    //   visualizer->Draw(&chessboard);
+    //   std::cout << "SPIELZUG: " << move << " | " << move_count << std::endl;
+    //   if (moves.size() == 0) {
+    //     break;
+    //   }
+    // }
+
+    // std::cout << std::endl;
+    // std::cout << "Game is over! - " << ((chessboard.GetOpponentPlayer()->GetColor() == ChessPieceColor::White) ? "White" : "Black") << " has won the game!" << std::endl;
+
+    // return 0;
+
+
 
     while (chessboard.IsCheckmate() == false) {
-      visualizer->Draw(&chessboard);
       std::string move;
       std::cout << "Move [" << ((chessboard.GetCurrentPlayer()->GetColor() == ChessPieceColor::White) ? "White" : "Black") << "] : ";
       std::cin >> move;
       chessboard.MoveChessPiece(move);
+      visualizer->Draw(&chessboard);
     }
 
     std::cout << "Game is over! - " << chessboard.GetOpponentPlayer()->GetName() << " has won the game!" << std::endl;

makefile

@@ -0,0 +1,10 @@
+all:
+	g++ -std=c++17 -o chess main.cpp ChessPieces/*.cpp Chessboard/*.cpp Player/*.cpp
+
+run:
+	./chess
+
+clean:
+	rm -f main.exe
+	rm -f chess.exe
+	rm -f chess

run.ps1

@@ -0,0 +1,2 @@
+& "g++" -std=c++17 -o chess main.cpp ChessPieces/*.cpp Chessboard/*.cpp Player/*.cpp
+./chess.exe