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Chess engine: Peacekeeper 1.50

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Peacekeeper - UCI engine
Author: Kyle Zhang  Rating CEDR=2828

v.1.50:
This release includes a further search than v1.40 with the exact same evaluation. (The next update will probably contain large evaluation changes.) Many minor changes in areas of the search contribute to the elo gain, such as using the TT in quiescence and a larger reduction in internal iterative deepening.

This release is 143 elo stronger in selfplay, and 77 elo stronger in a gauntlet against other opponents of similar strength.

ELO   | 143.48 +- 18.56 (95%)
CONF  | 5.0+0.05s Threads=1 Hash=32MB
GAMES | N: 1000 W: 528 L: 137 D: 335
Based on the strength gains, v1.50 should have a blitz elo of about 2790, and LTC elo at 2750.

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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