/// <summary>
/// Generates the move.
/// Adds check verification to move generation,
/// returns null if its own king will be in check.
/// </summary>
/// <param name="board">The board</param>
/// <param name="from">The starting square</param>
/// <param name="to">The ending square</param>
/// <returns></returns>
internal override Move GenerateMove(Board board, int from, int to)
{
Move move = base.GenerateMove(board, from, to);
if (move != null)
{
// verify for king in check
move.Make(board);
bool result = !board.WhiteKingInCheck();
move.TakeBack(board);
return(result ? move : null);
}
else
{
return(null);
}
}
/// <summary>
/// Generates the move.
/// Adds check verification to move generation,
/// returns null if its own king will be in check.
/// </summary>
/// <param name="board">The board</param>
/// <param name="from">The starting square</param>
/// <param name="to">The ending square</param>
/// <returns></returns>
internal override Move GenerateMove(Board board, int from, int to)
{
Move move = base.GenerateMove(board, from, to);
if (move != null)
{
move.IncrementMoves();// the number of moves is incremented after Black moves
// verify for king in check
move.Make(board);
bool result = !board.BlackKingInCheck();
move.TakeBack(board);
return(result ? move : null);
}
else
{
return(null);
}
}
/// <summary>
/// Go to the previous board configuration in history.
/// </summary>
public void Previous()
{
// if the game is not at the begining
if (!IsFirst)
{
Move move = moveHistory[currentBoardIndex - 1];
// build the event args
CancelMoveEventArgs moveEventArgs = new CancelMoveEventArgs(move, currentBoardIndex - 1);
// raise the GoingBack event
OnGoingBack(moveEventArgs);
// if the operation was cancelled
if (moveEventArgs.Cancel)
{
return;
}
// remove the current board hash from the history
RemoveHistoryHash();
// take back the move
move.TakeBack(currentBoard);
// generate the possible moves
GenerateMoves();
// set the status of the game
SetStatus();
// decrement the current board index
currentBoardIndex--;
// raise the GoneBack event
OnGoneBack(new MoveEventArgs(move, currentBoardIndex - 1));
}
}
/// <summary>
/// Takes back the move, it doesn't check if it's a valid move.
/// </summary>
/// <param name="board">The board</param>
internal override void TakeBack(Board board)
{
rookMove.TakeBack(board); // take back the rook move first
base.TakeBack(board); // take back the king move last to set the before board status
}