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Chess engine: Peacekeeper 1.20

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Peacekeeper - UCI engine
Author: Kyle Zhang  Rating CEDR=2552

v.1.2.0:
This release adds Late Move Pruning, but most of the strength gain comes from bug-fixes. I fixed a bug where the hash move was skipped, resulting in devastating blunders at long time control, and a bug in the PVS code in the root node. LMR also has been corrected, and is now also applied in non-PV nodes like it should. There are also some minor changes to pruning thresholds and tempo bonus.
This release is 119.5 elo stronger in selfplay, and 80 elo stronger in a gauntlet against other opponents of similar strength.

Individual statistics: Peacekeeper 0.12 - 220 games (+ 36,= 10,-174), 18.6 %
Critter 1.6a                  :  17 (+  0,=  1,- 16),  2.9 %
Stockfish 15                  :   6 (+  0,=  0,-  6),  0.0 %
ClassicAra 0.9.9              :   2 (+  0,=  0,-  2),  0.0 %
ChessKISS 1.8                 :   2 (+  1,=  0,-  1), 50.0 %
Xoron b196                    :   2 (+  1,=  1,-  0), 75.0 %
Chareth 0.1.0                 :   2 (+  2,=  0,-  0), 100.0 %
Fisherov chess monk 1.2       :   5 (+  0,=  0,-  5),  0.0 %
Nemorino 6.00                 :   1 (+  0,=  0,-  1),  0.0 %
Nalwald 16                    :   2 (+  0,=  0,-  2),  0.0 %
Black Marlin 7.0              :   1 (+  0,=  0,-  1),  0.0 %
Mantissa 3.7.2                :   4 (+  0,=  0,-  4),  0.0 %
RukChess 3.0                  :   2 (+  0,=  0,-  2),  0.0 %
Arche 0.3.5                   :   2 (+  1,=  0,-  1), 50.0 %
StockNemo 5.7.0.0             :   2 (+  0,=  0,-  2),  0.0 %
Marvin 6.1.0                  :   2 (+  0,=  0,-  2),  0.0 %
Berserk 10                    :   2 (+  0,=  0,-  2),  0.0 %
Stockfish 14.1                :   2 (+  0,=  0,-  2),  0.0 %
Fornax 4.0                    :   2 (+  0,=  1,-  1), 25.0 %
Crystal 5 KWK                 :   2 (+  0,=  0,-  2),  0.0 %
Eubos 2.15                    :   4 (+  2,=  0,-  2), 50.0 %
Stockfish dev-20221123-85ae65 :   2 (+  0,=  0,-  2),  0.0 %
Counter 5.0                   :   5 (+  0,=  0,-  5),  0.0 %
Kuma 1.0                      :   5 (+  0,=  0,-  5),  0.0 %
MadChess 3.2 beta             :   9 (+  1,=  0,-  8), 11.1 %
Princhess 0.8.0               :   5 (+  3,=  0,-  2), 60.0 %
Genko 1.0a                    :   7 (+  0,=  0,-  7),  0.0 %
Viridithas 5.1.0              :   5 (+  0,=  0,-  5),  0.0 %
Caissa 1.4                    :  12 (+  0,=  0,- 12),  0.0 %
Rebel 16                      :   9 (+  0,=  0,-  9),  0.0 %
Stockfish 15.1                :  11 (+  0,=  0,- 11),  0.0 %
Kookaburra 1.02               :   4 (+  0,=  0,-  4),  0.0 %
ShashChess 26.2               :  11 (+  0,=  0,- 11),  0.0 %
BrainLearn 20.2               :   4 (+  0,=  0,-  4),  0.0 %
Mayhem 7.8                    :  13 (+  5,=  5,-  3), 57.7 %
RubiChess 20221203            :  12 (+  0,=  0,- 12),  0.0 %
Lc0 0.29.0-rc1                :   2 (+  0,=  0,-  2),  0.0 %
Alexandria 3.1.0              :   3 (+  0,=  0,-  3),  0.0 %
Sting Black Hole 2            :   2 (+  0,=  0,-  2),  0.0 %
RapChess 2022-12-08           :   1 (+  1,=  0,-  0), 100.0 %
Cheese 3.1.0                  :   1 (+  0,=  0,-  1),  0.0 %
Clover 3.2                    :   2 (+  0,=  0,-  2),  0.0 %
Minic 3.31                    :   3 (+  0,=  0,-  3),  0.0 %
Cdrill 2000                   :   6 (+  4,=  1,-  1), 75.0 %
Quabla 04-04-2021             :   2 (+  0,=  1,-  1), 25.0 %
Clover 3.2.1                  :   2 (+  0,=  0,-  2),  0.0 %
Mayhem 7.9                    :   2 (+  0,=  0,-  2),  0.0 %
Chess-rs 0.1.1                :   4 (+  4,=  0,-  0), 100.0 %
Jangine 2022-12-01            :   8 (+  7,=  0,-  1), 87.5 %
Honey badger 0.0.0            :   4 (+  4,=  0,-  0), 100.0 %

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