MadChess 3.1 Released

I have released version 3.1 of my chess engine. I worked on the engine over the last year occasionally, when I had time in the evenings. Slowly, I’ve added about 100 Elo points of playing strength compared to the prior release.

This release includes strength improvements achieved by Singular Move, Threat Evaluation, Pawn Structure Evaluation, Move Legality Performance Improvement, Logarithmic LMR Based on QuietMoveNumber and ToHorizon, and evaluation of piece mobility, king safety (including x-ray moves), and threats using Safe Squares.

It also includes code quality improvements such as Color Agnostic Code, Removed Endgame King Safety Evaluation, Code Style Refactor (camelCased Method Parameters), Refactor Static Const to Enum, Reorganize Namespaces, and Remove Over-Counting NPS.

In addition, I fixed an Engine Hang Bug and an Invalid PV Bug.

You may download x64 and x86 versions of the engine from the Downloads page. Install the appropriate version for your computer’s CPU. The x64 binary is the strongest version of the engine.

I estimate MadChess 3.1 plays bullet chess at 2706 Elo and blitz chess at 2742 Elo.

Of course, you may decrease MadChess’ strength for a more enjoyable game via the UCI_LimitStrength and UCI_Elo engine parameters. Enjoy!

Now I’ll take a break from engine programming and actually play some chess. I’ll focus on improving my game (beyond patzer level) before the urge to improve MadChess’ game (to 2800 Elo) inevitably strikes.

 

Feature Category Date Commit1 WAC2 Elo Rating3 Improvement
Miscellaneous Improvements Evaluation 2022 Aug 30 6484a1b 287 2706 +19
Move Legality
Performance Improvement
Search 2022 Mar 18 533e382 289 2687 +36
Pawn Structure Evaluation 2022 Jan 11 d691b32 288 2651 +15
Threats Evaluation 2021 Oct 24 26e5323 289 2636 +7
Color-Agnostic Code Evaluation 2021 Sep 13 2b475bc 286 2629 +12
Singular Move Search 2021 Jun 14 0c601ea 290 2617 +13
Endgame Eval Scaling Evaluation 2021 Apr 08 4d22dec 286 2604 +12
Bishop Pair Evaluation 2021 Mar 14 2960ec9 285 2592 +22
Position Cache Optimization Search 2021 Feb 23 42d7702 286 2570 +8
Move Generation Optimization Search 2021 Feb 17 22002dc 287 2562 +12
PVS and Null Move Search 2021 Feb 09 f231dac 285 2550 +20
Remove Aspiration Windows Search 2020 Dec 20 4b7963b 290 2530 +9
Time Management Search 2020 Dec 19 d143bb5 286 2521 +8
Crash Bug Search 2020 Aug 29 2d855ec 288 2513 +0
King Safety Evaluation 2020 Aug 16 6794c89 288 2513 +63
Eval Param Tuning Evaluation 2020 Jul 23 bef88d5 283 2450 +30
Late Move Pruning Search 2020 Feb 08 6f3d17a 288 2420 +29
Piece Mobility Evaluation 2020 Feb 01 5c5d4fc 282 2391 +62
Passed Pawns Evaluation 2018 Dec 27 103 279 2329 +119
Staged Move Generation Search 2018 Dec 15 93 275 2210 +39
History Heuristics Search 2018 Dec 03 84 275 2171 +28
Eval Param Tuning Evaluation 2018 Nov 24 75 272 2143 +47
Sophisticated Search
Material and Piece Location
Baseline 2018 Nov 08 58 269 2096 0
  1. GitHub commit (hash) or Subversion source code revision (integer)
  2. Win At Chess position test, 3 seconds per position
  3. Bullet chess, 2 min / game + 1 sec / move
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