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Chess engine: Caissa 1.14.1

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Caissa - UCI chess engine,  Author: Michał Witanowski
Rating CEDR=3607

v.1.14.1:
Progression test
TC=8+0.08, Book=UHO_4060_v2.epd

Elo   | 35.98 +- 7.68 (95%)
Conf  | 8.0+0.08s Threads=1 Hash=32MB
Games | N: 4002 W: 1222 L: 809 D: 1971
Penta | [15, 350, 904, 671, 61]
TC=60+0.6, Book=UHO_4060_v2.epd

Elo   | 39.43 +- 14.73 (95%)
Conf  | 60.0+0.60s Threads=1 Hash=128MB
Games | N: 1000 W: 289 L: 176 D: 535
Penta | [2, 75, 235, 184, 4]
TC=180+1.8, Book=UHO_4060_v2.epd

Elo   | 37.14 +- 10.37 (95%)
Conf  | 180.0+1.80s Threads=1 Hash=256MB
Games | N: 2000 W: 569 L: 356 D: 1075
Penta | [0, 149, 495, 350, 6]
Changes
New neural net trained on total 4.5 billion positions generated in Caissa self-play games
experimenting with trainer hyperparameters, switched to Adam optimizer
~70B iterations
introduced positions from games started from a position sampled from high-quality tournament games with other engines (TCEC, CCRL, SP-CC)
introduced positions from SPRT games (both STC and LTC)
Introduce separate BMI2 binary version (uses more efficient PEXT move generation)
Improved continuation history heuristics
SPSA tuning search and move ordering parameters
Numerous search improvements:
better repetition handling
tweaking heuristics (LMR, IIR)
improved continuation history heuristics
Time manager tweaks (noticeable improvement in time control with big time increment)
Numerous small speedups
Started using PGO (profile-guided optimizations) for AVX2 and BMI2 builds

Caissa CEDR rating progress:
Pl Engine Rating Score Game %
605 Caissa 1.13 3607.6 37.50 72 52.08
609 Caissa 1.13.1 3601.5 599.50 974 61.55
643 Caissa 1.12 3574.2 520.00 898 57.91
651 Caissa 1.10 3565.5 180.00 326 55.21
652 Caissa 1.11 3564.4 241.50 376 64.23
667 Caissa 1.8 3533.2 506.00 902 56.10
684 Caissa 1.7 3505.9 221.50 354 62.57
690 Caissa 1.9 3498.7 80.00 182 43.96
727 Caissa 1.6.3 3446.6 196.00 449 43.65
747 Caissa 1.5 3420.0 249.50 573 43.54
748 Caissa 0.5 NNUE 3416.8 159.50 260 61.35
750 Caissa 1.4 3414.7 535.00 1279 41.83
763 Caissa 1.1 3397.4 91.50 175 52.29
766 Caissa 1.2 3391.6 76.50 182 42.03
771 Caissa 1.3 3386.3 237.50 667 35.61
789 Caissa 1.6 3359.2 63.50 179 35.47




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