/// <summary>
/// Checks if the king of the specified color is in check
/// </summary>
/// <param name="board"></param>
/// <param name="kingColor"></param>
/// <returns></returns>
public bool IsChecked(Color kingColor)
{
Board board = this;
int kingLocation = board.KingLocation(kingColor);
var attackerColor = (kingColor == Color.White) ? Color.Black : Color.White;
var attacks = board.GetAttackBoard(attackerColor);
// king is not in check
if (attacks[kingLocation] == 0)
{
return(false);
}
else
{
return(true);
}
}
private static void GetKingMoves(Board board, int square, int[] moves, ref int count)
{
int x = Board.X(square);
int y = Board.Y(square);
Color color = board.GetColor(square);
int target = 0;
if (y < 7)
{
target = square + 7;
if (x > 0 && board.GetColor(target) != color)
{
moves[count] = target;
count++;
}
target = square + 8;
if (board.GetColor(target) != color)
{
moves[count] = target;
count++;
}
target = square + 9;
if (x < 7 && board.GetColor(target) != color)
{
moves[count] = target;
count++;
}
}
target = square - 1;
if (x > 0 && board.GetColor(target) != color)
{
moves[count] = target;
count++;
}
target = square + 1;
if (x < 7 && board.GetColor(target) != color)
{
moves[count] = target;
count++;
}
if (y > 0)
{
target = square - 9;
if (x > 0 && board.GetColor(target) != color)
{
moves[count] = target;
count++;
}
target = square - 8;
if (board.GetColor(target) != color)
{
moves[count] = target;
count++;
}
target = square - 7;
if (x < 7 && board.GetColor(target) != color)
{
moves[count] = target;
count++;
}
}
// castling
// no quares between rook and king can be occupied, the king cannot pass through any checked attacked squares
if (color == Color.White && square == 4)
{
if (board.CanCastleKWhite && board.State[5] == 0 && board.State[6] == 0)
{
var attacks = board.GetAttackBoard(Color.Black);
if (attacks[4] == 0 && attacks[5] == 0 && attacks[6] == 0)
{
moves[count] = 6;
count++;
}
}
if (board.CanCastleQWhite && board.State[3] == 0 && board.State[2] == 0 && board.State[1] == 0)
{
var attacks = board.GetAttackBoard(Color.Black);
if (attacks[2] == 0 && attacks[3] == 0 && attacks[4] == 0)
{
moves[count] = 2;
count++;
}
}
}
else if (color == Color.Black && square == 60)
{
if (board.CanCastleKBlack && board.State[61] == 0 && board.State[62] == 0)
{
var attacks = board.GetAttackBoard(Color.White);
if (attacks[60] == 0 && attacks[61] == 0 && attacks[62] == 0)
{
moves[count] = 62;
count++;
}
}
if (board.CanCastleQBlack && board.State[59] == 0 && board.State[58] == 0 && board.State[57] == 0)
{
var attacks = board.GetAttackBoard(Color.White);
if (attacks[58] == 0 && attacks[59] == 0 && attacks[60] == 0)
{
moves[count] = 58;
count++;
}
}
}
}