Chess engine: Akimbo 0.4.0

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Akimbo is a UCI compatible Chess (and Chess960) engine written in Rust.
Rating CEDR=2723

v.0.4.0:
Changelog
Added History Gravity
Added Late Move Pruning
Added Aspiration Windows
Improving in RFP
Reduce Passed Pawns Less
Various Tweaks
Self-Play ELO
ELO   | 150.10 +- 12.36 (95%)
CONF  | 60.0+0.60s Threads=1 Hash=128MB
GAMES | N: 2000 W: 1019 L: 205 D: 776
https://chess.swehosting.se/test/2280/
Binaries
Follows the microarchitecture levels:

v1 is for compatibility with really old architectures
v2 is popcnt, sse, etc
v3 is for CPUs that are Haswell/Excavator or newer
v4 is for the most modern CPUs that support avx512
Please raise an issue if any of the binaries do not work as intended.

Individual statistics: Akimbo 0.3.0 - 205 games (+ 50,= 18,-137), 28.8  %
Critter 1.6a                  :  12 (+  0,=  0,- 12),  0.0 %
Zahak 10.0                    :   2 (+  0,=  0,-  2),  0.0 %
Vault 0.4                     :   2 (+  2,=  0,-  0), 100.0 %
MadChess 3.2 beta             :   2 (+  1,=  0,-  1), 50.0 %
Stockfish 15.1                :   2 (+  0,=  0,-  2),  0.0 %
Uralochka 3.39d               :   4 (+  0,=  0,-  4),  0.0 %
Sting Black Hole 4            :   2 (+  0,=  0,-  2),  0.0 %
Rebel 16.2                    :   2 (+  0,=  0,-  2),  0.0 %
Valiant Mk V                  :   2 (+  2,=  0,-  0), 100.0 %
Captain 4.0                   :   2 (+  2,=  0,-  0), 100.0 %
Pawn 1.0                      :   2 (+  0,=  0,-  2),  0.0 %
Knightx 3.7b                  :   2 (+  0,=  1,-  1), 25.0 %
Altair 2.0.0                  :   2 (+  1,=  1,-  0), 75.0 %
MrBob 1.2.0                   :   2 (+  0,=  0,-  2),  0.0 %
Tenax 0.7.9                   :   2 (+  0,=  1,-  1), 25.0 %
Zangdar 2.15.03               :   2 (+  1,=  0,-  1), 50.0 %
Lc0 0.30.0-rc1                :   2 (+  0,=  0,-  2),  0.0 %
SFT 26.04.2023                :   2 (+  0,=  0,-  2),  0.0 %
Queen 4.05                    :   4 (+  1,=  2,-  1), 50.0 %
Rice 5.0.0                    :   2 (+  0,=  0,-  2),  0.0 %
KnightX 3.7b                  :   2 (+  1,=  0,-  1), 50.0 %
Stockfish dev-20230503 Ivec   :   2 (+  0,=  0,-  2),  0.0 %
Polaris 1.6.1                 :   4 (+  1,=  1,-  2), 37.5 %
Viridithas 9.0.0              :   4 (+  0,=  0,-  4),  0.0 %
Vafra 12.4 Cfish              :   6 (+  0,=  0,-  6),  0.0 %
ShashChess GZ                 :   2 (+  0,=  0,-  2),  0.0 %
4ku 3.0                       :   2 (+  0,=  1,-  1), 25.0 %
Ice4 v3                       :   8 (+  2,=  3,-  3), 43.8 %
Ippolit 051323                :   6 (+  0,=  1,-  5),  8.3 %
Velvet 5.2.0                  :   4 (+  0,=  0,-  4),  0.0 %
Willow 2.8                    :   4 (+  0,=  0,-  4),  0.0 %
TheBaron 3.45                 :   6 (+  0,=  1,-  5),  8.3 %
Clover 4.1                    :   4 (+  0,=  0,-  4),  0.0 %
Eubos 2.21                    :   6 (+  5,=  0,-  1), 83.3 %
Fire 5192023                  :   6 (+  0,=  1,-  5),  8.3 %
Princhess 0.11.0              :   6 (+  4,=  1,-  1), 75.0 %
QuintBot 1.2.0                :  12 (+ 12,=  0,-  0), 100.0 %
StoneChess 2023-05-20         :   4 (+  3,=  1,-  0), 87.5 %
Fire-zero 5192023             :   2 (+  0,=  0,-  2),  0.0 %
Axon 0.3                      :   4 (+  3,=  0,-  1), 75.0 %
Bagatur 3.7d                  :   2 (+  0,=  0,-  2),  0.0 %
Demon 1.3                     :   4 (+  4,=  0,-  0), 100.0 %
Drofa 4.0.0                   :   4 (+  0,=  0,-  4),  0.0 %
Vengeance 3.0.0               :   4 (+  0,=  0,-  4),  0.0 %
Milady 4.36                   :   1 (+  1,=  0,-  0), 100.0 %
Sargon 1978 1.01b             :   4 (+  4,=  0,-  0), 100.0 %
Flounder 0.5.0.0              :   2 (+  0,=  0,-  2),  0.0 %
Roc 2.0.0                     :   2 (+  0,=  0,-  2),  0.0 %
Fire NN 5162023               :   4 (+  0,=  0,-  4),  0.0 %
ShashChess 32                 :   6 (+  0,=  1,-  5),  8.3 %
Brainlearn 24                 :   2 (+  0,=  0,-  2),  0.0 %
Polyfish 230510               :   2 (+  0,=  0,-  2),  0.0 %
Crystal 6 PMT                 :   4 (+  0,=  1,-  3), 12.5 %
Fire Zero 5192023             :   2 (+  0,=  0,-  2),  0.0 %
Stockfish dev-20230520        :   2 (+  0,=  0,-  2),  0.0 %
CorChess dev-20230521         :   2 (+  0,=  0,-  2),  0.0 %
CatroPOLY 2.4GCC 20230527     :   2 (+  0,=  0,-  2),  0.0 %
Altair 3.0.0                  :   2 (+  0,=  0,-  2),  0.0 %
SFT-BIN-CTG 23052023          :   2 (+  0,=  0,-  2),  0.0 %
Swordfish 15.4                :   2 (+  0,=  0,-  2),  0.0 %
Little Beast 2 sl             :   2 (+  0,=  1,-  1), 25.0 %



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