private IEnumerable <BoardPoint> EnumerateNeighbors(BoardPoint point)
{
yield return(point.ShiftLeft());
yield return(point.ShiftRight());
yield return(point.ShiftTop());
yield return(point.ShiftBottom());
}
private bool HasElementAt(BoardPoint point, params BoardElement[] elements)
{
return(elements.Any(elem => HasElementAt(point.X, point.Y, elem)));
}
