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Chess engine: Peacekeeper 1.70

on


Peacekeeper - UCI engine
Author: Kyle Zhang  Rating CEDR=3000

v.1.70:
This release includes many small tweaks and bugfixes to perfect HCE (hand-crafted evaluation). Some of the large changes include:
Updating bestmove on aspiration fail-high
Adjusting time control
Making negamax fail-soft (was a bug)
Adding LMP
FRC (Fischer Random Chess) and DFRC have also been implemented.

This release is 119 elo stronger in selfplay, and 104 elo stronger in a gauntlet against other opponents of similar strength.

ELO   | 119.11 +- 12.67 (95%)
CONF  | 5.0+0.05s Threads=1 Hash=8MB
GAMES | N: 2000 W: 977 L: 317 D: 706
Based on the strength gains, v1.70 should have a blitz elo of about 3110, and LTC elo of 3030.

Peacekeeper rating CEDR progress:
Pl
 Version
 CEDR
 Score games
 %
901 Peacekeeper 1.50 2845.2 37.00 107 34.58
909 Peacekeeper 1.4 2829.6 7.00 34 20.59
971 Peacekeeper 1.2 2736.9 15.00 94 15.96
1057 Peacekeeper 1.3 2586.1 34.00 129 26.36
1079 Peacekeeper 1.1 2542.8 25.00 98 25.51
1116 Peacekeeper 1.01 2476.7 15.00 64 23.44
1147 Peacekeeper 1.0 2416.6 13.50 110 12.27
1175 Peacekeeper 0.11 2373.8 19.00 104 18.27
1180 Peacekeeper 0.12 2366.9 47.50 246 19.31
1395 Peacekeeper 0.1 1883.0 4.00 33 12.12


Individual statistics: Peacekeeper 1.40 - 76 games (+ 14,= 11,- 51), 25.7  %
Akimbo 0.2.0                  :   2 (+  1,=  1,-  0), 75.0 %
SFT-PB                        :   2 (+  0,=  0,-  2),  0.0 %
Tenax 0.7.9                   :   4 (+  0,=  0,-  4),  0.0 %
Zangdar 2.15.03               :   4 (+  1,=  1,-  2), 37.5 %
Polaris 1.5.0                 :   4 (+  1,=  2,-  1), 50.0 %
Caissa 1.8                    :   4 (+  0,=  0,-  4),  0.0 %
SFT 26.04.2023                :   4 (+  0,=  0,-  4),  0.0 %
Mess 0.2.0                    :   4 (+  1,=  2,-  1), 50.0 %
Apotheosis 3.0.0              :   4 (+  4,=  0,-  0), 100.0 %
Queen 4.05                    :   4 (+  1,=  2,-  1), 50.0 %
Rice 5.0.0                    :   4 (+  0,=  0,-  4),  0.0 %
Polyfish 230426               :   4 (+  0,=  0,-  4),  0.0 %
SugaR AI ICCF SE              :   4 (+  0,=  0,-  4),  0.0 %
Flounder 0.5.0.0              :   4 (+  0,=  0,-  4),  0.0 %
Roc 2.0.0                     :   4 (+  0,=  0,-  4),  0.0 %
ChessKISS 1.8d                :   4 (+  3,=  1,-  0), 87.5 %
Svart 4.0.0                   :   4 (+  0,=  1,-  3), 12.5 %
nIPPOLIT                      :   4 (+  2,=  1,-  1), 62.5 %
Stockfish 20230422 Ivec       :   2 (+  0,=  0,-  2),  0.0 %
Stockfish 2030422             :   2 (+  0,=  0,-  2),  0.0 %
SF-PB 220423                  :   2 (+  0,=  0,-  2),  0.0 %
Corchess 20230422             :   2 (+  0,=  0,-  2),  0.0 %


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