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============================== My email: jotes@go2.pl



New version chess engine: Isa 4.0 NNUE

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Isa - chess engine
Author - Daniel Anulliero

v.4.0:
Here is the new release of Isa chess engine 

Isa is a bitboard chess engine , written from scratch . 
It is the bitboard port from my mailbox one (the best was 2.0.83 version , 2330 elo CCRL)
The hce bitboard version was about at the same level as 2.0.83 

Now it is NNUE , it has a (768-256)x2-1 net , trained on 2.1billion position from Isa self play 
The net is embedded in the binary 
The particular work of the NNUE version was done entirely by Martin Sedlak (Cheng autor)

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Changes : (not very detailled as we want to keep them a little bit secret , sorry) 

New net trained with 2.1b positions 
Fix pv promotions
tt probe in qs
More aggressive futility pruning (depth 0-5 instead of depth 0-3)
Aspiration windows
Clean ups
The tests give to 4.0 version an improvement of +80 elo vs 3.9 (fast tc 8" + 0.08" increment)
So an expected Elo of around 3120 


Rating Chess Engines Diary CEDR=2678


Isa 4.0 NNUE - download
All files (games, tables and engines) - download from page
Github: https://github.com/Dany1962/Isa

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