Cinder - UCI chess engine
Author: Bruno Dutra Rating Chess Engines Diary CEDR=3784
Great news – there’s a new version of the Cinder engine!
The last version, Cinder 0.5.2, competed in the 2nd CEDR Chess Engine League and took 4th place in the 08/2026 season, just missing promotion to the top league. It’ll be exciting to see how the updated version performs in the next round.
Cinder 0.6.0 what's new?
LTC
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Results of dev vs v0.5.2 (40+0.4, 1t, 256MB, UHO_Lichess_4852_v1.epd):
Elo: 55.04 +/- 6.02, nElo: 116.39 +/- 12.52
LOS: 100.00 %, DrawRatio: 47.97 %, PairsRatio: 3.97
Games: 2960, Wins: 962, Losses: 497, Draws: 1501, Points: 1712.5 (57.85 %)
Ptnml(0-2): [2, 153, 710, 608, 7], WL/DD Ratio: 0.92
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What's Changed
Increase the time allocated per move at the start of the game by @brunocodutra in #1148
Vectorize movegen by @brunocodutra in #1156
Update the NNUE arch with threat inputs by @brunocodutra in #1158
Update the NNUE arch with pawn-pawn inputs by @brunocodutra in #1168
Improve mate finding by @brunocodutra in #1169
Cinder 0.4.1 vs other engines:
| Obsidian 16.15 SE | 25.5/66 | -15 | 66 games |
| Clover 9.1 JA | 29.5/64 | -5 | 64 games |
| Integral 7.0.0 JA | 22/54 | -10 | 54 games |
| Motor 0.9.0 | 11.5/27 | -4 | 27 games |
| Dragon 3.3 | 5.5/14 | -3 | 14 games |
| Revenge 4.0 | 6/10 | +2 | 10 games |
| Peacekeeper 3.01 JA | 5/10 | +0 | 10 games |
| Horsie 1.1.0 | 4.5/10 | -1 | 10 games |
| Viridithas 19.0.1 | 4.5/10 | -1 | 10 games |
| Integral 7 dev.8bab JA | 3.5/10 | -3 | 10 games |
| Fire 10 | 5/8 | +2 | 8 games |
| Elixir 3.0 JA | 5/8 | +2 | 8 games |
| Altair 7.2.1 JA | 4.5/8 | +1 | 8 games |
| Akimbo 1.1.0 JA | 4/8 | +0 | 8 games |
| Dragon free | 4/8 | +0 | 8 games |
| Booot 7.4 | 4/8 | +0 | 8 games |
| Texel 1.13a4 JA | 3.5/6 | +1 | 6 games |
| Clarity 8.0.0 JA | 3.5/6 | +1 | 6 games |
| Koivisto 9.2 JA | 3.5/6 | +1 | 6 games |
| Rebel-EAS 2.0 | 3/6 | +0 | 6 games |
| Equisetum 1.30 JA | 3/6 | +0 | 6 games |
Achievements of the Cinder chess engine, see entry:
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