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 JA | 14/14 | +14 | 14 Games |
| Renegade 1.2.0 | 7/14 | +0 | 14 Games |
| Quirky 1.0 | 12/12 | +12 | 12 Games |
| Bread Engine 1.4.0 | 11.5/12 | +11 | 12 Games |
| Knightx 4.4 | 11.5/12 | +11 | 12 Games |
| Tarnished 2.0 | 11/12 | +10 | 12 Games |
| Illumina 3 | 10/12 | +8 | 12 Games |
| Leorik 3.1.3 JA | 9/12 | +6 | 12 Games |
| Pawn 4.0 | 7.5/12 | +3 | 12 Games |
| Calvin 6.1.0 JA | 7.5/12 | +3 | 12 Games |
| Prophet 4.4 JA | 10/10 | +10 | 10 Games |
| Zangdar 3.09.01 JA | 6/10 | +2 | 10 Games |
| Critter 1.6a | 3.5/4 | +3 | 4 Games |
| Horsie 1.1.0 | 2/4 | +0 | 4 Games |
| Arasan 25.1 | 2/4 | +0 | 4 Games |
| Cool Iris v18 | 1.5/4 | -1 | 4 Games |
| Artemis 14TR | 1/4 | -2 | 4 Games |
| Crystal 9 | 0.5/4 | -3 | 4 Games |
| Feuerstein 0.4.6.1 JA | 2/2 | +2 | 2 Games |
| Whitespine 1.3.0 | 2/2 | +2 | 2 Games |
| Pedone 3.1 | 1.5/2 | +1 | 2 Games |
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