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Chess engine: Peacekeeper 2.20

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Peacekeeper - UCI engine
Author: Kyle Zhang  Rating CEDR=3342

v.2.20:
This (small) release is mostly search patches, such as cutnodes, fail-firm RFP, less futility, and other tweaks, with a new net.
In standard chess, this release is 76 elo stronger in selfplay, and 65 elo stronger in a gauntlet against other opponents of similar strength.

Elo   | 76.45 +- 15.76 (95%)
Conf  | 5.0+0.05s Threads=1 Hash=8MB
Games | N: 1002 W: 372 L: 155 D: 475
Penta | [2, 56, 202, 205, 36]
In DFRC, this release is 84 elo stronger in selfplay.

Elo   | 83.76 +- 15.78 (95%)
Conf  | 5.0+0.05s Threads=1 Hash=8MB
Games | N: 1002 W: 382 L: 145 D: 475
Penta | [9, 60, 179, 191, 62]
Based on the strength gains, v2.20 should have a blitz elo of about 3400, LTC elo of about 3280, and FRC elo of about 3590 (on CCRL scales).

A note on executables: Different executables for windows have been compiled for different instruction sets. AVX512 is the fastest, followed by AVX2, and POPCNT. Pick the fastest one that doesn't crash on your computer.

Peacekeeper rating CEDR progress:
Pl Engine Rating Score Games %
867 Peacekeeper 2.10 3342.3 62.00 236 26.27
874 Peacekeeper 2.00 3334.3 171.00 316 54.11
1020 Peacekeeper 1.71 3138.0 180.50 362 49.86
1059 Peacekeeper 1.70 3093.0 141.50 306 46.24
1123 Peacekeeper 1.60 3023.5 109.00 200 54.50
1231 Peacekeeper 1.50 2864.2 37.00 107 34.58
1239 Peacekeeper 1.4 2848.4 7.00 34 20.59
1313 Peacekeeper 1.2 2761.0 15.00 94 15.96
1327 Peacekeeper 1.40 2746.9 19.50 76 25.66
1403 Peacekeeper 1.3 2608.0 34.00 129 26.36
1429 Peacekeeper 1.1 2571.3 25.00 98 25.51
1484 Peacekeeper 1.01 2488.5 15.00 64 23.44
1519 Peacekeeper 1.0 2433.2 13.50 110 12.27
1533 Peacekeeper 1.10 2413.1 8.00 32 25.00
1551 Peacekeeper 0.11 2389.5 19.00 104 18.27
1561 Peacekeeper 0.12 2383.6 47.50 246 19.31
1800 Peacekeeper 0.1 1892.1 4.00 33 12.12



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