gistfile1.cs

public override System.Collections.Generic.IEnumerable<FigurePosition> GetPossibleTargets(BoardState state)
{
    for (FigurePosition pos = Position; pos.IsValid() && !state.IsPositionOccupied(pos, false); pos += new Vector(1, 1))
        yield return pos;
    for (FigurePosition pos = Position; pos.IsValid() && !state.IsPositionOccupied(pos, false); pos += new Vector(-1, 1))
        yield return pos;
    for (FigurePosition pos = Position; pos.IsValid() && !state.IsPositionOccupied(pos, false); pos += new Vector(1, -1))
        yield return pos;
    for (FigurePosition pos = Position; pos.IsValid() && !state.IsPositionOccupied(pos, false); pos += new Vector(-1, -1))
        yield return pos;
}