private IEnumerable<BoardCoordinate> GetCastleMoveIfAvailable(BoardCoordinate rookStart, BoardCoordinate moveIfSuccess)
{
var piece = _board.GetPiece(rookStart);
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 isBlocked = spacesBetweenKingAndRook.Any(bc => _board.GetPiece(bc) != null);
if (piece != null && !piece.HasMoved && !isBlocked)
yield return moveIfSuccess;
}
private bool IsBlocked(BoardCoordinate origin, BoardCoordinate destination)
{
var checker = new PathMaker(origin, destination);
var spacesAlongPath = checker.GetPathToDestination();
var lastSpace = spacesAlongPath.LastOrDefault();
return spacesAlongPath.Any(space => DoesFriendlyPieceExistAt(origin, space)) || spacesAlongPath.Any(space => DoesPieceExistAt(space) && !space.Equals(lastSpace));
}
