private bool IsMoveThreatenedKing(Piece moveCandidate, BoardCoordinate moveDestination)
{
var evaluator = new ThreatEvaluator(this);
return(moveCandidate is King &&
evaluator.IsThreatened(moveDestination, moveCandidate.IsFirstPlayerPiece));
}
private IEnumerable <BoardCoordinate> GetCastleMoveIfAvailable(BoardCoordinate rookStart, BoardCoordinate moveIfSuccess)
{
var piece = _board.GetPiece(rookStart);
if (piece != null)
{
var kingCoordinate = BoardCoordinate.For(KingColumn, rookStart.Y);
var pathMaker = new PathMaker(kingCoordinate, rookStart);
var spacesBetweenKingAndRook = pathMaker.GetPathToDestination().Where(bc => bc.X != rookStart.X && bc.X != KingColumn);
var threatEvaluator = new ThreatEvaluator(_board);
var wouldKingBeThreatened = spacesBetweenKingAndRook.Any(bc => threatEvaluator.IsThreatened(bc, piece.IsFirstPlayerPiece));
var isBlocked = spacesBetweenKingAndRook.Any(bc => _board.GetPiece(bc) != null);
if (!piece.HasMoved && !isBlocked && !wouldKingBeThreatened)
{
yield return(moveIfSuccess);
}
}
}