Chess engine: Alexandria
Author: PGG106 Rating Chess Engines Diary CEDR=3710
v.8.0
LTC Progression test
Elo | 14.88 +- 2.80 (95%)
Conf | 60.0+0.60s Threads=1 Hash=64MB
Games | N: 5000 W: 374 L: 160 D: 4466
Penta | [1, 103, 2083, 307, 6]
Progression test was run on the 8moves_v3.epd book.
Unbalanced LTC Progression test
Elo | 42.25 +- 4.53 (95%)
Conf | 60.0+0.60s Threads=1 Hash=64MB
Games | N: 5000 W: 1592 L: 987 D: 2421
Penta | [4, 283, 1327, 876, 10]
Progression test was run on the Pohl.pgn book.
Search Changes
Improved NMP.
Improved 3fold detection.
Introduced Probcut.
Tuned most of search.
SE was manually tuned for better scaling on longer time controls.
Introduced quiet move ordering tweaks based on static evaluation.
Eval Changes
The net shipped with this release has a new arch, the input bucket count went from 1 to 16 and the HL has been shrinked from 2048 to 1536, resulting in a final arch of (768->1536x16)x2->1x8 .
Finny tables were added to greatly speed-up the evaluation.
Misc stuff
Decreased stack usage fixing a rare crash on windows systems.
Simplified movegen.
Improved the makefile flag selection.
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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