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official-stockfish / Stockfish

A free and strong UCI chess engine
https://stockfishchess.org/
GNU General Public License v3.0
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Stockfish does not see mate in 9 fast enough #182

Closed Karlon closed 9 years ago

Karlon commented 9 years ago

In this position; 3r4/4r2k/3p1p1b/2n1p1pQ/2B1b3/P3B1PP/2PR1P2/3R2K1 w - - 0 34

At first, Stockfish decided to actually play for a DRAW when there's a clear mate in 9! It was not until 15 minutes, when SF decided to choose Bxg5 (which is the right move and can mate black in just 9 moves, or less)

This problem effects time management adversely.

Karlon commented 9 years ago

Correction: I made a typo, it took 5 minutes, not 15.

Karlon commented 9 years ago

But still, 5 minutes is quite a lot. It was a simple and a pristine move, which SF should have chosen quickly rather than pondering for a long period.

bunkbail commented 9 years ago

These things are not bug-related issue, so please don't post them here. If you need a mate solver version of Stockfish, you can find it here https://github.com/jhellis3/Stockfish/tree/mate_finder

Or disabling null move and futility pruning can help tactical positions a lot. You can see the patch here https://github.com/nabildanial/Stockfish/tree/no_null_move_futility

Of course, as lucasart already pointed it out, doing these things can affect ELO.

Karlon commented 9 years ago

Nabil, thanks for sharing these wonderful patches but they still don't help in finding tactical/positional sacrifices in complex positions, they just ignore them. I am looking for a patch that could potentially solve the problems listed here; https://github.com/official-stockfish/Stockfish/issues/180

mcostalba commented 9 years ago

You are just looking for spamming the issue list!

And with me we are already 3 people trying to explain you that this list is NOT for report this kind of things.

Please report your stuff on the fishtest forum. This list is only for bugs report. Where bug it does not mean SF does not do what you want in your preferred position.

Closed again!

On Thu, Jan 1, 2015 at 3:10 PM, Karlon notifications@github.com wrote:

Nabil, thanks for sharing these wonderful patches but they still don't help in finding tactical/positional sacrifices in complex positions, they just ignore them. I am looking for a patch that could potentially solve the problems listed here; #180 https://github.com/official-stockfish/Stockfish/issues/180

— Reply to this email directly or view it on GitHub https://github.com/official-stockfish/Stockfish/issues/182#issuecomment-68487460 .