internal override MoveCheckResult CanMoveLeft(ChessBoard board, BoardTile currentTile, BoardTile destinationTile, int count = 8)
{
MoveCheckResult result = base.CanMoveLeft(board, currentTile, destinationTile, count);
// Check for legal castling move
if (isInInitialPosition)
{
var rooks = board.TilesByPieceType(typeof(Rook), this.IsWhite);
foreach (var rook in rooks)
{
if (rook != destinationTile)
{
continue;
}
if (rook.OccupyingPiece is Rook piece)
{
if (piece.IsInInitialPosition)
{
if (rook.X == 0)
{
// check right path
if (board.Tiles[currentTile.Y, currentTile.X - 1].OccupyingPiece == null && rook.CanMoveTo(board, board.Tiles[currentTile.Y, currentTile.X - 1]))
{
result = MoveCheckResult.CanMove;
}
}
else if (rook.X == 7)
{
// check left path
if (board.Tiles[currentTile.Y, currentTile.X + 1].OccupyingPiece == null && rook.CanMoveTo(board, board.Tiles[currentTile.Y, currentTile.X + 1]))
{
result = MoveCheckResult.CanMove;
}
}
}
}
}
}
return(result);
}
/// <summary> /// Returns if the given <see cref="MoveCheckResult"/> represents a legal move, even if that move is incomplete. /// </summary> public static bool IsLegalMove(this MoveCheckResult moveCheckResult) => (moveCheckResult & MoveCheckResult.IllegalMove) == MoveCheckResult.OK;
private void CompareMoveTypes(MoveType expectedMoveType, MoveType actualMoveType, ref MoveCheckResult moveCheckResult)
{
if (actualMoveType != expectedMoveType)
{
if (expectedMoveType == MoveType.Default || actualMoveType != MoveType.Default)
{
// Given actualMoveType should not have been specified.
switch (actualMoveType)
{
case MoveType.Promotion:
moveCheckResult |= MoveCheckResult.IllegalMoveTypePromotion;
break;
case MoveType.EnPassant:
moveCheckResult |= MoveCheckResult.IllegalMoveTypeEnPassant;
break;
case MoveType.CastleQueenside:
moveCheckResult |= MoveCheckResult.IllegalMoveTypeCastleQueenside;
break;
case MoveType.CastleKingside:
moveCheckResult |= MoveCheckResult.IllegalMoveTypeCastleKingside;
break;
}
}
else
{
// Only warn that a different MoveType was expected. Not an illegal move though.
switch (expectedMoveType)
{
case MoveType.Promotion:
moveCheckResult |= MoveCheckResult.MissingPromotionInformation;
break;
case MoveType.EnPassant:
moveCheckResult |= MoveCheckResult.MissingEnPassant;
break;
case MoveType.CastleQueenside:
moveCheckResult |= MoveCheckResult.MissingCastleQueenside;
break;
case MoveType.CastleKingside:
moveCheckResult |= MoveCheckResult.MissingCastleKingside;
break;
}
}
}
}
