public void RecordCutOffMove(
[NotNull] GameBoard board,
[NotNull] GameMove move,
int plyDistance,
int remainingDepth,
[CanBeNull] ICollection <GameMove> previousQuietMoves)
{
if (board is null)
{
throw new ArgumentNullException(nameof(board));
}
if (move is null)
{
throw new ArgumentNullException(nameof(move));
}
if (plyDistance < MinDepth || plyDistance > MaxDepth)
{
throw new ArgumentOutOfRangeException(
nameof(plyDistance),
plyDistance,
$@"The value is out of the valid range ({MinDepth} .. {MaxDepth}).");
}
if (board.State.IsAnyCheck() || remainingDepth <= 0)
{
return;
}
if (!board.ValidMoves.TryGetValue(move, out var moveFlags) || !LocalHelper.IsQuietMove(moveFlags))
{
return;
}
var moveBonus = remainingDepth.Sqr();
lock (_syncLock)
{
_killerMoveDatas[plyDistance - 1].RecordKiller(move);
UpdateHistoryTableUnsafe(board, move, moveBonus);
if (previousQuietMoves is null || previousQuietMoves.Count == 0)
{
return;
}
foreach (var previousQuietMove in previousQuietMoves)
{
UpdateHistoryTableUnsafe(board, previousQuietMove, -moveBonus);
}
}
}
private static void AddSingleKillerMove(
[CanBeNull] GameMove killerMove,
[NotNull] Dictionary <GameMove, GameMoveFlags> remainingMoves,
[NotNull] List <OrderedMove> resultList)
{
if (killerMove is null || !remainingMoves.TryGetValue(killerMove, out var moveFlags) ||
!LocalHelper.IsQuietMove(moveFlags))
{
return;
}
var orderedMove = new OrderedMove(killerMove, moveFlags);
resultList.Add(orderedMove);
remainingMoves.Remove(killerMove);
}