Another version of a very powerful chess engine has appeared, which wants to beat Stockfish. We are very happy about this - we will do the first tests of this version of the engine for you soon.
Caissa - UCI chess engine, Author: Michaล Witanowski
Rating Chess Engines Diary CEDR=3712.6
Caissa 1.24 - what's new?
A small, incremental release: gaining Elo at this level is getting harder without a new architecture and much more compute. The new version focuses on new nets, search cleanups, and the first proper SMP tuning, with especially nice gains in DFRC.
Changes
Evaluation
New neural net trained on 17B positions
Added a castling-rights bonus for FRC/DFRC, combining well with the new nets for larger gains there than in regular chess.
Removed KRvKR and KQvKQ specialty code (was causing low-time blunders).
Search & TT
Store eval in TT as early as possible in QSearch.
In PV nodes, skip QSearch on the TT move (idea by Viz from Stockfish).
Increased NMP start depth (more conservative at shallow depth).
Added a recapture extension.
Increased the “improving” factor in RFP.
Simplified move ordering and eval adjustment code paths.
TT now updates the move field even when the entry is not overwritten.
Removed current-move reporting from the search output.
First dedicated multithreaded tuning (≈31k games, 20+0.2, 8 threads), giving about +5 Elo on 4 threads.
Time management & SMP
Tweak with the biggest gain in high-increment games (≈+4 Elo).
Progression test
SMP LTC (20+0.2, 4 threads)
Elo | 17.33 +- 3.96 (95%)
Conf | 20.0+0.20s Threads=4 Hash=128MB
Games | N: 6964 W: 1758 L: 1411 D: 3795
Penta | [5, 639, 1847, 986, 5]
https://furybench.com/test/3969/
LTC (60+0.6)
Elo | 8.84 +- 2.38 (95%)
Conf | 60.0+0.60s Threads=1 Hash=128MB
Games | N: 20010 W: 4835 L: 4326 D: 10849
Penta | [19, 2133, 5185, 2656, 12]
https://furybench.com/test/3935/
DFRC LTC (60+0.6)
Elo | 10.33 +- 2.17 (95%)
Conf | 60.0+0.60s Threads=1 Hash=128MB
Games | N: 17118 W: 2595 L: 2086 D: 12437
Penta | [28, 1110, 5792, 1583, 46]
Caissa 1.23 vs other engines:
| Alexandria 8.1.2 | 17.5/32 | +3 | 32 Games |
| HypnoS ++ 1.03 | 10.5/21 | +0 | 21 Games |
| YuliGM Pro 20 | 9.5/21 | -2 | 21 Games |
| OmegaCor 280825 | 9.5/19 | +0 | 19 Games |
| Fire 10 mingw | 12.5/18 | +7 | 18 Games |
| Pawnocchio 1.8.1 | 12/18 | +6 | 18 Games |
| DarkZoryn 2.0 | 8.5/17 | +0 | 17 Games |
| SF-POLY 200825 | 8/17 | -1 | 17 Games |
| Critter 1.6a | 15/15 | +15 | 15 Games |
| PlentyChess 6.0.18 | 7.5/15 | +0 | 15 Games |
| Astra 6.1.1 | 9/14 | +4 | 14 Games |
| Stockfish dev-20250906 | 6.5/14 | -1 | 14 Games |
| Laser 1.8 beta JA | 11.5/12 | +11 | 12 Games |
| Halogen 15.0.0 | 6/12 | +0 | 12 Games |
| Spirit XXL | 6/12 | +0 | 12 Games |
| Alexander 6.0 | 10/10 | +10 | 10 Games |
| Lambergar 1.3 | 10/10 | +10 | 10 Games |
| Claw 3.0-M | 5/10 | +0 | 10 Games |
| ShashChess 39.1 | 5/10 | +0 | 10 Games |
| Artemis 18.2TR | 5/10 | +0 | 10 Games |
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