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



Astra 6.0 - new version chess engine



Astra is a UCI chess engine written in C++.
Author: Semih Özalp

v.6.0:
Release Notes
This release includes newly trained weights with a new arch and improvements to the search functionality.

Neural Network (NNUE)
Updated arch from (10×768 → 1024)×2 → 1 to (12×768 → 1536)×2 → 1
Changed hidden activation function from clipped ReLU to squared clipped ReLU
Search
Minor improvements to search logic
Added pawn history heuristic for improved move ordering
Miscellaneous
Various small improvements in functionality and readability
Results vs. Astra 5.2
Elo   | 127.59 +- 9.58 (95%)
Conf  | 60.0+0.60s Threads=1 Hash=128MB
Games | N: 1206 W: 507 L: 83 D: 616
Penta | [0, 15, 179, 379, 30]
The test was done with the UHO_Lichess_4852_v1.epd opening book.

I still have Ideas to make it even stronger but these will be inlcuded in the next release!

Astra 5.2 vs other engines:

Kobra 2.0 JA14/14+1414 Games
Renegade 1.2.07/14+014 Games
Quirky 1.012/12+1212 Games
Bread Engine 1.4.011.5/12+1112 Games
Knightx 4.411.5/12+1112 Games
Tarnished 2.011/12+1012 Games
Illumina 310/12+812 Games
Leorik 3.1.3 JA9/12+612 Games
Pawn 4.07.5/12+312 Games
Calvin 6.1.0 JA7.5/12+312 Games
Prophet 4.4 JA10/10+1010 Games
Zangdar 3.09.01 JA6/10+210 Games
Critter 1.6a3.5/4+34 Games
Horsie 1.1.02/4+04 Games
Arasan 25.12/4+04 Games
Cool Iris v181.5/4-14 Games
Artemis 14TR1/4-24 Games
Crystal 90.5/4-34 Games
Feuerstein 0.4.6.1 JA2/2+22 Games
Whitespine 1.3.02/2+22 Games
Pedone 3.11.5/2+12 Games


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