New engine releases 2026 H2

[Andres Valverde]

Dirty Urusel released

https://sites.google.com/view/dirtychess/dirtychess

[Spunc595]

Luna CE v3.1.1

https://github.com/Spunc595/Luna-Chess- ... tag/v3.1.1

[Roland Chastain]

Moustique (JSSchach UCI) 0.4.5.

New: fixed a bug where a move leading to a stalemate had the same value than a move leading to a checkmate. Several optimizations and corrections.

Result of a little tournament:

Code: Select all

Rank Name                          Elo     +/-   Games   Score    Draw 
   1 Monchester 1.0.1              241      52     160   80.0%   27.5% 
   2 Moustique 0.4.5                89      43     160   62.5%   37.5% 
   3 Moustique 0.4.1                48      42     160   56.9%   41.3% 
   4 Alouette 0.1.9                -50      42     160   42.8%   40.6% 
   5 NEG 1.3                      -429      78     160    7.8%   13.1% 

SPRT: llr 0 (0.0%), lbound -inf, ubound inf

...
Player: Moustique 0.4.1
   "Draw by 3-fold repetition": 38
   "Draw by stalemate": 28
   "Loss: Black mates": 16
   "Loss: White mates": 20
   "Win: Black mates": 32
   "Win: White mates": 26
Player: Moustique 0.4.5
   "Draw by 3-fold repetition": 53
   "Draw by fifty moves rule": 1
   "Draw by stalemate": 6
   "Loss: Black mates": 12
   "Loss: White mates": 18
   "Win: Black mates": 36
   "Win: White mates": 34

Still no time management. Plays instantly. Toy engine.

Git repository: https://codeberg.org/rchastain/moustique
Linux and Windows binaries: https://msegui.net/downloads/chess/

[mysammoore]

SimpleChess 3.1.0
Sam Moore (Canada)
https://github.com/LinkLikesLattes/SimpleChess

[DeNooseDaniel]

Euphron Neo 0.46 (UCI)

https://www.kingdomofcaissa.com/

[Aleks Peshkov]

Petrel 4.1
https://github.com/AleksPeshkov/petrel/ ... s/tag/v4.1

This version is update to 4.0 that was rushed in time.
Small mostly speed improvements. I predict modest 30 Elo CCRL gain.

I expect next Petrel release will not be soon.