Chess engine: Alexandria
Author: PGG106 Rating Chess Engines Diary CEDR=3726
Alexandria 8.1.12 what's new?
Search Changes
Improved quiet moves fp.
Introduced conthist penalty for early pre TT-cutoff moves.
Improved TT cut-off condition.
Avoid IIR while in check.
Allow triple extension of tactical moves.
Fixed a bug in static eval move ordering.
Prevented singular search from returning decisive scores.
Several QSearch improvements.
Eval Changes
New net with a 2 step training.
Removed material draw check.
Stability improvements
Improved fen handling for partial fens.
Completely fixed the stalling problem that was partially addressed in 8.1.2.
Greatly reduced the engine stack usage (reduces crashes on MacOS).
Misc changes
Fixed conthist tuning.
Added support for minimal UCI output.
Improved android support (Still not an official target).
Alexandria 8.1.12 - progression test:
A release with some minor Elo gains and greatly improved stability.
LTC Progression test
Elo | 8.95 +- 3.75 (95%)
Conf | 60.0+0.60s Threads=1 Hash=64MB
Games | N: 7024 W: 1917 L: 1736 D: 3371
Penta | [6, 637, 2044, 820, 5]
Alexandria 8.0.0 - results:
| Stockfish 17.1 | 19/39 | -1 | 39 Games |
| PlentyChess 6.0.5 JA | 14/28 | +0 | 28 Games |
| Berserk 20250307b | 12/22 | +2 | 22 Games |
| Dragon 3.3 | 10.5/22 | -1 | 22 Games |
| Berserk 20250606 | 9.5/20 | -1 | 20 Games |
| Yuliana 7.0 | 9.5/20 | -1 | 20 Games |
| RubiChess 20250606 JA | 9/18 | +0 | 18 Games |
| Cool Iris 14 | 8/18 | -2 | 18 Games |
| Lc0 0.31.2 | 8/14 | +2 | 14 Games |
| Kookaburra 3.10 | 7/14 | +0 | 14 Games |
| Cool Iris v19 | 7/14 | +0 | 14 Games |
| DarkSeid 6.2 EE | 6/14 | -2 | 14 Games |
| Obsidian dev-16.14 | 6.5/13 | +0 | 13 Games |
| CalvinChess 6.0.0 JA | 9/12 | +6 | 12 Games |
| Stormphrax 6.0.0 | 7/12 | +2 | 12 Games |
| Booot 7.4 | 6/12 | +0 | 12 Games |
| Green Way | 5.5/12 | -1 | 12 Games |
| Contact 12 | 5/12 | -2 | 12 Games |
| Mayhem 8.8 JA | 10/10 | +10 | 10 Games |
| Uralochka 3.42 dev13 | 7/10 | +4 | 10 Games |
| Pawnocchio 1.7.2 | 7/10 | +4 | 10 Games |
Top tournament results for the Alexandria chess engine:
Our social media:
Comments
Post a Comment