[Board] Implement enPassant move handling

Board.cpp

@@ -108,13 +108,25 @@ void Board::makeMove(const Move &move) {
         }
     }
 
-    // en passant
+    handleEnPassant(move, movedPiece);
+
     handlePawnDoubleAdvance(move, toBB, movedPiece);
 
 
     // change turn
     mTurn = !mTurn;
 }
+void Board::handleEnPassant(const Move &move, const Piece &movedPiece) {
+    if (movedPiece.type() == PieceType::Pawn && mEPS.has_value() && move.from().file() != move.to().file()) {
+        auto epBB = indexToBitBoard(Square::fromCoordinates(move.to().file(), move.from().rank())->index());
+        auto capturedPiece = Piece(!mTurn, PieceType::Pawn);
+
+        mPieceBBs[toIndex(capturedPiece.color())] ^= epBB;
+        mPieceBBs[toIndex(capturedPiece.type())] ^= epBB;
+        mOccupiedBB ^= epBB;
+    }
+}
+
 void Board::handlePawnDoubleAdvance(const Move &move, BitBoard bb, const Piece &movedPiece) {
     if (movedPiece.type() == PieceType::Pawn) {
         auto fromR = move.from().rank();

Board.hpp

@@ -128,6 +128,7 @@ private:
     }
 
     void handlePawnDoubleAdvance(const Move &move, BitBoard bb, const Piece &movedPiece);
+    void handleEnPassant(const Move &move, const Piece &movedPiece);
 };
 
 std::ostream &operator<<(std::ostream &os, const Board &board);