EveAnn - UCI chess engines
Rating Chess Engines Diary CEDR=3380
EveAnn is a small Winboard chess engine written by Andrés Valverde. It plays a decent chess, but is much weaker than Dirty. Via the INI file you can set up 5 different strength levels. It plays a funny and optimistic chess so I hope you enjoy it.
From version 2.0 I ran a little experiment to check how many ELO could gain a little chess engine like EveAnn using Stockfish NNUE technology. It uses Daniel Shawul library to access the SF NNUE code, and I had to compile it as a DLL (NNUE.DLL file) and write a little interface to it in Pascal so that EveAnn could access it. To my surprise the ELO gain was huge, around +450 ELO, maybe more (I estimated around 2.800 ELO CCRL) and the best thing that encouraged me to release, it plays a very interesting and funny chess. The Pascal interface to the nnue.dll is freely available for any use. The NNUE file is derivated from Danasah NNUE file (thanks to Pedro Castro for his help !), reinforced with 300 million of new positions (that only gave +10-15 ELO though). If you delete or rename de NNUE file, EveAnn will run using the old HCE evaluation (Hand Crafted Evaluation), more or less like version 1.73.
EveAnn 6.0 what's new?:
Added new NN almost same dataset but labelled based in static eval instead of search.
Several changes in time management
Little bug fixed
Expected +20 ELO at long TC and +30 at 2'+1"
Bench : 144.844 nodes (NNUE mode)
EveAnn 5.1 vs other engines:
| Cheng4 0.48 | 1.5/2 | +1 | 2 games |
| Midnight 9 JA | 1/2 | +0 | 2 games |
| Nalwald ab11891 JA | 1/2 | +0 | 2 games |
| Weiss 2.1 JA | 1/2 | +0 | 2 games |
| Illumina 3.0 JA | 1/2 | +0 | 2 games |
| Rice 8.0.0 | 1/2 | +0 | 2 games |
| Grail 2.0.1 | 1/2 | +0 | 2 games |
| Tucano 12.17 JA | 1/2 | +0 | 2 games |
| Expositor 5 JA | 0.5/2 | -1 | 2 games |
| Leorik 3.2 | 0.5/2 | -1 | 2 games |
| Smallbrain 7.0 JA | 0.5/2 | -1 | 2 games |
| Winter 5.0 JA | 0.5/2 | -1 | 2 games |
| Marvin 6.3.0 JA | 0.5/2 | -1 | 2 games |
| Willow 4.0.0 | 0.5/2 | -1 | 2 games |
| Lynx 1.11.0 | 1/1 | +1 | 1 games |
| Jackal 2.0.0 | 1/1 | +1 | 1 games |
| Cwtch 6 | 0.5/1 | +0 | 1 games |
| Sapling 1.2.7 | 0.5/1 | +0 | 1 games |
| Caligula 7.0 JA | 0.5/1 | +0 | 1 games |
| Stash 37.10 JA | 0.5/1 | +0 | 1 games |
| Avalanche 2.1.0 | 0.5/1 | +0 | 1 games |
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