long PerftCount(int depth)
{
Depth = depth;
Results = new PerftResults();
Results.StartDepth = Depth;
return(PerftCount(Board.Copy(), Depth));
}
/// <summary>
/// Figures out if the specified move puts or keeps your own king in check, which is illegal
/// </summary>
/// <param name="board"></param>
/// <param name="from"></param>
/// <param name="to"></param>
/// <returns></returns>
public bool MoveSelfChecks(int from, int to)
{
Board board = this;
Color colorToMove = board.GetColor(from);
board = board.Copy();
board.Move(from, to, false);
bool ok = board.IsChecked(colorToMove);
return(ok);
}
private long PerftCount(Board boardBase, int depth)
{
long total = 0;
// find all the moves
var moves = Moves.GetMoves(boardBase);
for (int i = 0; i < moves.Length; i++)
{
Move move = moves[i];
var board = boardBase.Copy();
bool valid = board.Move(move.From, move.To, true);
if (!valid)
{
continue;
}
if (move.Promotion > 0)
{
board.Promote(move.To, move.Promotion);
}
long cnt = (depth == 1) ? 1 : PerftCount(board, depth - 1);
total += cnt;
// log data in the top node
if (Results.StartDepth == depth)
{
Results.Entries.Add(new PerftEntry()
{
Count = cnt, From = move.From, To = move.To
});
}
}
if (Results.StartDepth == depth)
{
Results.Total = total;
}
return(total);
}