public static ulong GetLegalMoves(this BitBoard board, byte player)
{
// https://intellitect.com/when-to-use-and-not-use-var-in-c/
// https://stackoverflow.com/a/41505/11898496
var moves = 0UL;
var playerPiece = board.Pieces[player];
var opponentPiece = board.Pieces[Constant.Opponent(player)];
var empties = board.GetEmpties();
// https://stackoverflow.com/a/105402/11898496
foreach (var direction in DirectionValues)
{
var candidates = opponentPiece & playerPiece.Shift(direction);
while (candidates != 0)
{
var candidatesShifted = candidates.Shift(direction);
moves |= empties & candidatesShifted;
candidates = opponentPiece & candidatesShifted;
}
}
return(moves);
}
public static bool IsGameComplete(this BitBoard board)
{
return(board.GetEmpties() == 0 || !board.HasAnyPlayerHasAnyLegalMove());
}
