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Chess engine: Simbelmyne 1.8.0

on

 


Simbelmyne - UCI engine
Rating CEDR=2474

v.1.8.0:
What's new
This version mostly focuses on search tweaks. Most every tweak I could get to
gain has been included, so I imagine we're getting into diminishing returns and
~5 Elo patches.

Simbelmyne 1.8 is around 180 Elo stronger than 1.7 in STC self-play.
A small gauntlet places Simbelmyne at around 3050 Blitz 🎉

   # PLAYER                     : RATING    POINTS  PLAYED    (%)
   1 Avalanche 1.3              : 3085.0     322.0     727   44.3%
   2 Princhess 0.15             : 3073.0     330.5     726   45.5%
   3 Akimbo 0.5                 : 3058.0     405.5     728   55.7%
   4 Simbelmyne 1.8.0           : 3052.5    3221.5    5811   55.4%
   5 Koivisto 3.0               : 3027.0     328.0     726   45.2%
   6 Nalwald 16                 : 3001.0     389.5     726   53.7%
   7 Viridithas 3.0             : 2985.0     296.0     726   40.8%
   8 Black Marlin 2.0           : 2938.0     265.0     726   36.5%
   9 Polaris 1.7.0              : 2937.0     253.0     726   34.8%
Added features
🔍 Search
Tweak aspiration window implementation (20.5+/-14.2) (#207)
Reduce PV nodes less instead of non-pv nodes more (10.1+/-8.1) (#208)
History table refactor (#209) (#210)
Tweak quiet history penalties and ageing (35.9+/-20.1) (#211)
1 ply continuation history (21.6+/-14.6) (#215)
Countermove table (13.4+/-10.4) (#216)
Don't overwrite TT move in all-nodes (21.6+/-14.7) (#217)
Include promotions in tacticals in (somewhat) staged movegen (#220)
Use "improving" heuristic in LMP (18.8+/-13.4) (#221)
Use "improving" in NMP (11.1+/-7.5) (#222)
Reduce more/less according to history score (16.7+/-12.3) (#223)
⚖️: Evaluation
Make incremental eval term branchless (#204)
🐛 Bugfixes
Fix SEE to work with non-zero margins (#202)
Only report "stop_early" when there's one legal move in root (#205)
Fix nodecounts and nps reporting (#206)
Fix LMP move threshold (23.8+/-15.7) (#219)
♟️ Lichess Bot
Tweak Dockerfile to fetch and build source from main
Add deploy script for easy redeploys
Tweak deploy script to GC old containers/images
Misc
Use fixed-point multiplication trick instead of module based indexing of TT (12+/-8) (#203)
See the respective PRs for self-play results where relevant

Choosing a binary
This release comes with precompiled binaries for all major platforms. Because
the engine benefits tremendously from more modern CPU instruction sets, there
are binaries compiled for major instruction sets, following the x86-64
microarchitecture levels
as a naming scheme.

Realistically, on modern hardware (< 10 years old), you should be okay to use the
binaries labeled V3. If the engine crashes within the first seconds, try V2,
and so on.


Simbelmyne 1.5.1 - results:
Critter 1.6a0.5/3-23 Partii
Caissa 1.180/3-33 Partii
Alexandria 6.1.00/3-33 Partii
Akimbo 1.0.00/3-33 Partii
Victoire 1.3.02/2+22 Partii
Zagreus 5.02/2+22 Partii
Cadabra 2.0.12/2+22 Partii
Tcheran 2.22/2+22 Partii
Yakka 1.01.5/2+12 Partii
Delocto 0.71/2+02 Partii
Bagatur 3.7e0.5/2-12 Partii
Vafra 14.12.1 Stockfish0/2-22 Partii
Peacekeeper 2.400/2-22 Partii
Pawn 3.00/2-22 Partii
Obsidian 12.00/2-22 Partii
Midnight 90/2-22 Partii
Velvet 7.3.00/2-22 Partii
Clarity 6.0.00/2-22 Partii
Seer 2.7.00/2-22 Partii
Rebel 16.30/2-22 Partii
Arasan 24.20/2-22 Partii

Simbelmyne 1.8.0 download


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