public void MtdfIds()
{
var ids = new MtdfIds()
{
Depth = Depth,
};
ids.Tt = ids.MakeTt(TtCapacity);
ids.Search(State.Start);
}
static void Search(
State root,
MtdfIds searcher,
GoSettings settings,
Program program,
CancellationToken ct)
{
ISearchInfo info;
{
using var _ = searcher.IterationCompleted.Subscribe(icInfo =>
{
// todo: even if we have cached tt info, we should be outputting the full pv
// todo: output other info fields (see stockfish)
var output = $"info depth {icInfo.Depth} time {(int)icInfo.Elapsed.TotalMilliseconds} nodes {icInfo.NodesSearched} score cp {icInfo.Score} pv {string.Join(' ', icInfo.Pv)}";
WriteLine(output);
});
info = searcher.Search(root, ct);
}
// if we finished but we're in ponder or infinite mode, wait until we receive "ponderhit" or "stop"
while (!ct.IsCancellationRequested && (settings.Infinite || program._ponder))
{
Thread.Sleep(500);
}
// output the best move. if the pv contains more than 1 move (eg. there's not a mate in 1 and we searched more than depth 1),
// output that too as the next move we expect the user to play.
Debug.Assert(!info.Pv.IsEmpty);
var output = $"bestmove {info.Pv[0]}";
if (info.Pv.Length > 1)
{
output += $" ponder {info.Pv[1]}";
}
WriteLine(output);
}