EveAnn 3.6 - winboard chess engine. New version!

EveAnn - winboard chess engines
Rating Chess Engines Diary CEDR=2215

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 3.6 what's new?:

 : Uncommented and tuned futility pruning. Added SEE pruning in search

              Fixed a bug in time manager, engine used too much time in first moves. 

              Fixed IO system , to avoid some illegal moves playing at long TC

              Ponder mode allowed again. (Worked fine at October monthly tour)

              Expected +10/15 ELO

              Bench : 173.275 nodes (no EGBB, NNUE mode) Note :former versions command was "Bench2"

EveAnn 3.5 vs other engines:

Shallow 5 dev.8483 JA	8/8	+8	8 Games
RustyKnight 2.0	8/8	+8	8 Games
Halogen 15.8.0	1/8	-6	8 Games
Clovis III dev.5d50 JA	5.5/6	+5	6 Games
Dog 4.10	3/6	+0	6 Games
Tuna 1.0.0 JA	3.5/4	+3	4 Games
Crab 4.6.3 JA	2.5/4	+1	4 Games
Critter 1.6a 64-bit	0.5/4	-3	4 Games
Reckless 0.9.0 JA	0.5/4	-3	4 Games
Arasan 25.2 JA	0.5/4	-3	4 Games
K2 1.0 alpha dev.9b2a JA	2/2	+2	2 Games
Petrel 2.1 JA 2025-10-14	2/2	+2	2 Games
CeeChess 2.1	2/2	+2	2 Games
Eubos 4.2 JA	2/2	+2	2 Games
Supernova 2.4 JA	2/2	+2	2 Games
Obsidian dev-16.15 SE	0.5/2	-1	2 Games
Raid 4.7	0.5/2	-1	2 Games
ShashChess 39.1 JA	0.5/2	-1	2 Games
Corchess 20251005	0.5/2	-1	2 Games
PlentyChess 7.0.2	0.5/2	-1	2 Games
SF-PRO2 02.05.2025	0/2	-2	2 Games

EveAnn 3.6 download