private IEnumerable <(Figure, Position)> FindPossibleBlockers(Figure culprit, Position kingPosition, TeamColor kingTeamColor)
{
if (culprit.FigureType == FigureType.Knight)
{
return(new List <(Figure, Position)>());
}
var path = new Vector(culprit.Position, kingPosition).GetPath();
var blockers = new List <(Figure, Position)>();
foreach (var field in path)
{
for (int i = 0; i < _board.GetBoardSize(); i++)
{
for (int j = 0; j < _board.GetBoardSize(); j++)
{
var figure = _board.FigureAt(_board.GetPositionAt(i, j));
if (figure != null &&
figure.TeamColor == kingTeamColor &&
figure.FigureType != FigureType.King &&
figure.CanMove(field) &&
_moveValidator.CanMove(figure, field).Item1)
{
blockers.Add((figure, field));
}
}
}
}
return(blockers);
}
public (bool, string) CanMove(Position from, Position destination)
{
var figure = _board.FigureAt(from);
if (figure == null)
{
return(false, "There is no figure at the given position");
}
if (!figure.CanMove(destination))
{
return(false, $"This move is not possible for a type figure: {figure.FigureType}");
}
var moveValidatorResult = _moveValidator.CanMove(figure, destination);
if (!moveValidatorResult.Item1)
{
return(moveValidatorResult);
}
if (_verifier.VerifyMoveCauseCheck(figure.Position, destination))
{
return(false, "You can't make this move, because it would put your king in a chequered position");
}
return(true, "OK");
}
private Figure FindFigureCausingCheck(Figure king)
{
for (int i = 0; i < OrdinaryChessBoard.BoardSize; i++)
{
for (int j = 0; j < OrdinaryChessBoard.BoardSize; j++)
{
var figure = _board.FigureAt(_board.GetPositionAt(j, i));
if (figure != null &&
figure.TeamColor != king.TeamColor &&
figure.CanMove(king.Position) &&
_moveValidator.CanMove(figure, king.Position).Item1)
{
return(figure);
}
}
}
return(null);
}