Chess engine: Alexandria
Author: PGG106 Rating Chess Engines Diary CEDR=3690
v.7.1.0
LTC Progression test
Elo | 24.85 +- 3.17 (95%)
Conf | 60.0+0.60s Threads=1 Hash=64MB
Games | N: 5000 W: 518 L: 161 D: 4321
Penta | [0, 104, 1946, 439, 11]
Progression test was run on the 8moves_v3.epd book.
Search Changes
Improved RFP
Improved NMP
Introduced Pawn, non-Pawn, and continuation Corrhist
Introduced Complexity based LMR scaling
Introduced Root History
Improved 3fold repetition detection
Improved SEE mode ordering
Eval Changes
The net shipped with this release has a new arch, the L1 size was increased to 2048, resulting in a final arch of (768->2048)x2->1x8 . Horizontal mirroring was introduced, improving the net strength without increasing its size.
Weights are now clipped at +- 1.414 allowing for better quantization.
The eval code has been reworked and the eval update is now fully lazy, resulting in improved speed (given the same net size)
Introduced an evaluation grain of 16.
TM Changes
Introduced Eval stability TM.
Misc stuff
The engine has a better and more efficient handling of input and output buffers.
The TT and its buckets were aligned resulting in greater speed.
The engine will now print a final info line with the best up to date info possible when stopping the search.
Alexandria 7.0.0 - results:
| Opponent | Score | +- | Games |
| Berserk 13 | 76/166 | -14 | 166 Games |
| Chess-System-Tal-2 | 81/139 | +23 | 139 Games |
| Ethereal 14.25 | 67.5/137 | -2 | 137 Games |
| Obsidian 13.0 | 57/123 | -9 | 123 Games |
| RubiChess 20240112 | 58.5/115 | +2 | 115 Games |
| Uralochka 3.41a JA | 63/112 | +14 | 112 Games |
| Titan 1.1.0 | 57.5/108 | +7 | 108 Games |
| PlentyChess 3.0.0 | 48.5/99 | -2 | 99 Games |
| Clover 6.2 | 44/78 | +10 | 78 Games |
| Seer 2.8.0 | 41/72 | +10 | 72 Games |
| Caissa 1.19 | 33/70 | -4 | 70 Games |
| Lizard 10.5 | 34.5/65 | +4 | 65 Games |
| Caissa 1.20 | 29.5/65 | -6 | 65 Games |
| Obsidian 12.29 | 31/61 | +1 | 61 Games |
| Caissa 1.18 | 28.5/54 | +3 | 54 Games |
| Dragon 3.3 | 23.5/52 | -5 | 52 Games |
| Rebel 16.3 | 26.5/48 | +5 | 48 Games |
| Peacekeeper 3.01 | 27/47 | +7 | 47 Games |
| Lizard 10.4 | 27/47 | +7 | 47 Games |
| Peacekeeper 3.00 | 26.5/46 | +7 | 46 Games |
| Viridithas 13.0.0 | 26/46 | +6 | 46 Games |
| Stockfish 16.1 | 17/38 | -4 | 38 Games |
| Motor 0.7.0 | 18/37 | -1 | 37 Games |
| Clover 7.0 JA | 19.5/36 | +3 | 36 Games |
| PlentyChess 2.0.0 | 18.5/36 | +1 | 36 Games |
| PlentyChess 1.0.0 | 16/32 | +0 | 32 Games |
| Starzix 5.0 | 19/31 | +7 | 31 Games |
| Koivisto 9.2 | 17/29 | +5 | 29 Games |
| Viridithas 14.0.0 | 13.5/29 | -2 | 29 Games |
| Stormphrax | 19.5/26 | +13 | 26 Games |
| Clover 7.1 JA | 12/25 | -1 | 25 Games |
| Akimbo 1.0.0 | 16/22 | +10 | 22 Games |
| RubiChess 20240817 | 12/22 | +2 | 22 Games |
| Alexander 1.3 | 13.5/20 | +7 | 20 Games |
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