/// <summary>
/// Determine if the king can move out of check by capturing a piece or simply moving.
/// </summary>
private bool CanKingMoveOrCaptureOutOfCheck(IKing king, IBoardState gameBoardState)
{
var canKingMoveOutOfCheck = false;
var canKingCaptureOutOfCheck = false;
// 1.) Can the king move or capture out of check?
foreach (ChessPosition position in king.ThreatenSet)
{
IMove move = ModelLocator.CreateMove(king.Location, position);
ICapture capture = ModelLocator.CreateCapture(king.Location, position);
canKingMoveOutOfCheck |= IsMoveLegal(king, move, gameBoardState);
canKingCaptureOutOfCheck |= IsCaptureLegal(king, capture, gameBoardState);
}
return(canKingMoveOutOfCheck || canKingCaptureOutOfCheck);
}
/// <summary>
/// Does the active player control a piece that can capture the piece threatening the king?
/// </summary>
private bool CanThreateningPieceBeCaptured(IPiece threateningPiece)
{
foreach (IPiece activePlayerPiece in ActivePlayerPieces)
{
activePlayerPiece.GenerateCaptures(GameBoard.State, ActivePlayerBoardState);
bool canCaptureAt = activePlayerPiece.CanCaptureAt(threateningPiece.Location);
if (!canCaptureAt)
{
continue;
}
ICapture capture = ModelLocator.CreateCapture(activePlayerPiece.Location, threateningPiece.Location);
bool isCaptureLegal = IsCaptureLegal(activePlayerPiece, capture, GameBoard.State);
if (isCaptureLegal)
{
return(true);
}
}
return(false);
}