Search found 71 matches

by mhouppin
Wed Nov 25, 2020 10:20 am
Forum: Computer Chess Club: General Topics
Topic: New engine: Stash
Replies: 98
Views: 24134

Re: New engine: Stash

Hi there, version 24 is out ! I again focused on search for this update, here are the improvements made: - Changed IID by reducing depth when a TT entry cannot be found (Thanks to Rebel for this idea); - Changed Futility Pruning to check for an advantage while having the move (eval > beta + some_mar...
by mhouppin
Wed Nov 18, 2020 8:44 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: Stash 21.2 64-bit Gauntlet for CCRL 40/15
Replies: 2
Views: 193

Re: Stash 21.2 64-bit Gauntlet for CCRL 40/15

Thanks for the testing, Graham ! I'm very happy to see Stash getting closer and closer to that 3000 Elo bar ^^
by mhouppin
Thu Nov 12, 2020 7:42 pm
Forum: Computer Chess Club: General Topics
Topic: New engine: Stash
Replies: 98
Views: 24134

Re: New engine: Stash

Hi there, as Frank mentioned it, version 23 is out ! Stash got added to OpenBench less than 2 weeks ago, so I would like to thank Andrew Grant, Noobpwnftw, and all OB users. Here's the list of improvements: - added Late Move Pruning; - fixed repetition counter when doing the verification search for ...
by mhouppin
Sun Nov 08, 2020 9:55 am
Forum: Computer Chess Club: General Topics
Topic: New engine: Stash
Replies: 98
Views: 24134

Re: New engine: Stash

Hi there, Stash 22 is out ! Here is what's new in this version: - Changed the LMR formula to a linear version (slightly less aggressive than the sqrt()'s one); - Full tune of the evaluation function (this was done for the version 21, twice with Texel's Tuning and once with Gradient Descent based on ...
by mhouppin
Sun Oct 11, 2020 8:59 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Linux friendly engines at all levels
Replies: 60
Views: 10000

Re: Linux friendly engines at all levels

Stash should cover a wide zone of your 2000-2700 Elo range, and very easy to build on Linux: https://gitlab.com/mhouppin/stash-bot Acording to CCRL 40/4 ratings and personal testing: v21.0: 2720 Elo v20.4: 2630 Elo (commit hash: 2056f46e) v20.0: 2530 Elo v18.0: 2440 Elo v17.0: 2350 Elo v16.0: 2290 E...
by mhouppin
Thu Oct 08, 2020 3:22 pm
Forum: Computer Chess Club: General Topics
Topic: Knight Sac by Thinker 5.1c Passive - Does Your Engine Play It?
Replies: 12
Views: 1142

Re: Knight Sac by Thinker 5.1c Passive - Does Your Engine Play It?

So I was running a tournament between a bunch of stylish engines and witnessed a typically brutal attacking game by an old (but famous) version of Thinker... 13.Nxf7!? is a very interesting move not because it is so brilliant, but because this type of position comes up SOO often in Thinker's games....
by mhouppin
Mon Sep 28, 2020 5:52 pm
Forum: Computer Chess Club: General Topics
Topic: New engine releases 2020
Replies: 525
Views: 135668

Re: New engine releases 2020

Version 21 of Stash released: https://gitlab.com/mhouppin/stash-bot/-/releases/v21.0 This version mostly consists of a large tuning of eval features. Huge thanks to Andrew Grant for his paper on Ethereal's tuning method and his "quiet" dataset. I didn't measure precisely the rating improvements, but...
by mhouppin
Wed Sep 16, 2020 9:39 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Is cloning a hobby?
Replies: 79
Views: 11378

Re: Is cloning a hobby?

Dann Corbit wrote:
Wed Sep 16, 2020 9:32 pm
If he shares the source code where is it?
I did not see it on github.
https://github.com/jtseng20/Beef
by mhouppin
Fri Aug 28, 2020 7:40 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: __builtin_popcountll doesn't bring any gain
Replies: 16
Views: 4290

Re: __builtin_popcountll doesn't bring any gain

The POPCNT instruction is (somehow) part of the SSE4 (Streaming SIMD Extensions 4) instruction set, so if you don't enable its use explicitly (by specifying -mpopcnt to the compiler (or -march=nehalem for Intel, -march=barcelona for AMD)), the compiler with replace the builtin popcount by its own im...
by mhouppin
Thu Aug 27, 2020 9:44 am
Forum: Computer Chess Club: General Topics
Topic: New engine: Stash
Replies: 98
Views: 24134

Re: New engine: Stash

Hi there, version 20 is out ! Some improvements on the evaluation have been made: - Doubled King Safety bonus for endgame; - Retired unsafe squares (squares controlled by enemy pawns) from Mobility; - Changed phase estimation by delaying endgame. The self-tests show a gain of 70-80 Elo, but as usual...