Chess engine: Peacekeeper 2.20

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

Peacekeeper 2.20 download