public List <Chessboard> GetNeighbourhoodOf(Queen queen)
{
var neighbourhood = new List <Chessboard>();
neighbourhood.AddRange(queen
.Position
.GetAdjacentFields(BoardSize)
.Where(coords => !HasQueenOn(coords))
.Select(coords =>
{
var newQueensList = Queens.Where(q => q != queen).ToList();
newQueensList.Add(new Queen(coords.X, coords.Y));
return(new Chessboard(newQueensList));
}));
return(neighbourhood);
}
