Chess engine: Alexandria
Author: PGG106 Rating CEDR=3669
v.7.0.0
LTC Progression test
Elo | 26.46 +- 3.35 (95%)
Conf | 60.0+0.60s Threads=1 Hash=64MB
Games | N: 5000 W: 561 L: 181 D: 4258
Penta | [0, 114, 1915, 448, 23]
Progression test was run on the 8moves_v3.epd book.
Search Changes
A new fully staged movepicker.
Improved lmrDepth formula.
Improved SEE accuracy.
Fixed a bug that would render TT moves illegal when unpacking them.
Introduced upcoming draw detection via cuckoo tables.
Faster makemove.
Faster evaluation achieved by removing one accumulator copy and saving the eval in the TT during QS.
General simplifications and improvements.
NNUE Changes
The net shipped with this release has a new arch, the L1 size was increased to 1536 and 8 output buckets were added,
resulting in a final arch of (768->1536)x2->1x8
Several hyperparameters improvements in the net training
Alexandria 6.1.0 - results:
| Rebel 16.3 | 32/60 | +4 | 60 Partii |
| Clover 6.1.19 | 24.5/48 | +1 | 48 Partii |
| Caissa 1.18 | 22/44 | +0 | 44 Partii |
| Berserk 13 | 18/43 | -7 | 43 Partii |
| RubiChess 20240112 | 19/40 | -2 | 40 Partii |
| Obsidian 12.0 | 17/40 | -6 | 40 Partii |
| Chess-System-Tal-2 | 17/32 | +2 | 32 Partii |
| Uralochka 3.41 dev3 | 19/30 | +8 | 30 Partii |
| Velvet 7.3.0 | 18.5/30 | +7 | 30 Partii |
| Ethereal 14.25 | 17/30 | +4 | 30 Partii |
| Vafra 14.12.1 Stockfish | 14.5/30 | -1 | 30 Partii |
| Stockfish 20240330 Ivec | 7.5/21 | -6 | 21 Partii |
| Stockfish 16.1 | 9/20 | -2 | 20 Partii |
| Viridithas 12.0.0 | 11.5/18 | +5 | 18 Partii |
| Seer 2.8.0 | 8.5/18 | -1 | 18 Partii |
| Rice 8.0.0 | 12.5/16 | +9 | 16 Partii |
| Peacekeeper 2.40 | 11/16 | +6 | 16 Partii |
| Yuli GM Pro 16 | 5/15 | -5 | 15 Partii |
| Jet 1.2 | 12/14 | +10 | 14 Partii |
| Arasan 24.2.2 | 9.5/14 | +5 | 14 Partii |
| Stockfish 20240411 | 6.5/14 | -1 | 14 Partii |
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