Maelstrom - UCI-compliant Golang chess engine in development from scratch.
Author: Saigautam Bonam
Maelstrom 3.3.0 - what's new?
Estimated ELO: 3310
Changelist
Feature (move ordering): implement countermove heuristic
Feature (move ordering): implement 1-ply conthist
Optimization (LMR): rework LMR entirely to be based on fractional depth reductions
Feature (LMR): add history calculation and whether hash move is capture to LMR calculation
Feature (static eval cache): add TT static eval correction
Simplification (SEE): make SEE threshold based
Feature (time management): add soft time management scaling with best move stability, score stability, and node ratio
Maelstrom 3.3.0 author tests:
vs. Maelstrom v3.2.0
STC:
Score of Maelstrom v3.3.0 vs Maelstrom v3.2.0: 125 - 26 - 111 [0.689] 262
... Maelstrom v3.3.0 playing White: 70 - 7 - 54 [0.740] 131
... Maelstrom v3.3.0 playing Black: 55 - 19 - 57 [0.637] 131
... White vs Black: 89 - 62 - 111 [0.552] 262
Elo difference: 138.1 +/- 32.4, LOS: 100.0 %, DrawRatio: 42.4 %
SPRT: llr 2.89 (100.1%), lbound -2.25, ubound 2.89 - H1 was accepted
LTC:
Score of Maelstrom v3.3.0 vs Maelstrom v3.2.0: 112 - 30 - 169 [0.632] 311
... Maelstrom v3.3.0 playing White: 65 - 12 - 78 [0.671] 155
... Maelstrom v3.3.0 playing Black: 47 - 18 - 91 [0.593] 156
... White vs Black: 83 - 59 - 169 [0.539] 311
Elo difference: 93.8 +/- 25.8, LOS: 100.0 %, DrawRatio: 54.3 %
SPRT: llr 2.9 (100.5%), lbound -2.25, ubound 2.89 - H1 was accepted
vs. Stash 34 (~3330) LTC
Score of Maelstrom v3.3.0 vs Stash 34.0: 492 - 589 - 491 [0.469] 1572
... Maelstrom v3.3.0 playing White: 295 - 258 - 234 [0.524] 787
... Maelstrom v3.3.0 playing Black: 197 - 331 - 257 [0.415] 785
... White vs Black: 626 - 455 - 491 [0.554] 1572
Elo difference: -21.5 +/- 14.2, LOS: 0.2 %, DrawRatio: 31.2 %
SPRT: llr -2.27 (-78.6%), lbound -2.25, ubound 2.89 - H0 was accepted
Maelstrom 3.2.0 vs other engines:
| Jinx 1.0 JA | 8/8 | +8 | 8 Games |
| Adeon 1.2.1 | 8/8 | +8 | 8 Games |
| Tomcat 1.0 JA | 6.5/8 | +5 | 8 Games |
| Lambergar 1.2 | 2.5/8 | -3 | 8 Games |
| Oxide 1.4.0 | 2.5/8 | -3 | 8 Games |
| Zahak 10.0 JA | 2.5/8 | -3 | 8 Games |
| Tucano 12.17 JA | 2/8 | -4 | 8 Games |
| Illumina 3.0 JA | 2/8 | -4 | 8 Games |
| Velvet 9.0.0 dev7 JA | 1/8 | -6 | 8 Games |
| Halogen 13.10.0 | 0.5/8 | -7 | 8 Games |
| Bagatur 5.3 | 1/6 | -4 | 6 Games |
| Bitbit 1.4 | 2.5/4 | +1 | 4 Games |
| Saturn 1.3 JA | 2.5/4 | +1 | 4 Games |
| Fritz 15 | 2.5/4 | +1 | 4 Games |
| Fritz 20 | 1/4 | -2 | 4 Games |
| Critter 1.6a | 0.5/4 | -3 | 4 Games |
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