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Sable 3.0.0 - new version chess engine

on


Sable, a UCI chess engine written from scratch in C++, with a self-trained NNUE evaluation. Estimated strength: ~3200 CCRL (single-threaded, estimated) — see Strength.
Sable was built and trained on a single desktop PC (Intel i7-11700K + RTX 3070) — the neural network's training data was generated entirely by the engine playing itself, with no external datasets or pretrained weights.
Author: dylan2554

Sable 3.0 what's new?

Its version 3 o'clock 🥳
This version has undergone Sable's first (and second and third :3) SPSA tune, giving a gigantic heap of elo.

As well as this, Sable is now a decent chunk faster than its previous version, and it features a stronger net with some search improvements too!

I estimate this new version is around 3450 CCRL

Performance
Sable 3.0.0 vs Sable 2.0.0
STC

Elo   | 272.03 +- 13.85 (95%)
Conf  | 8.0+0.08s Threads=1 Hash=16MB
Games | N: 2176 W: 1485 L: 61 D: 630
Penta | [2, 16, 127, 442, 501]
https://chess.n9x.co/test/7513/

LTC

Elo   | 237.01 +- 12.17 (95%)
Conf  | 40.0+0.40s Threads=1 Hash=64MB
Games | N: 2066 W: 1274 L: 49 D: 743
Penta | [0, 9, 169, 476, 379]
https://chess.n9x.co/test/7514/

LTC (SMP 4T)

Elo   | 198.28 +- 21.95 (95%)
Conf  | 40.0+0.40s Threads=4 Hash=256MB
Games | N: 504 W: 297 L: 37 D: 170
Penta | [0, 7, 41, 141, 63]
https://chess.n9x.co/test/7516/

LTC (DFRC)

Elo   | 196.56 +- 24.30 (95%)
Conf  | 40.0+0.40s Threads=1 Hash=16MB
Games | N: 572 W: 388 L: 95 D: 89
Penta | [0, 1, 98, 80, 107]
https://chess.n9x.co/test/7517/

VLTC

Elo   | 205.04 +- 21.20 (95%)
Conf  | 120.0+1.20s Threads=1 Hash=16MB
Games | N: 500 W: 298 L: 33 D: 169
Penta | [0, 4, 39, 145, 62]
https://chess.n9x.co/test/7515/

Sable 3.0.0 vs Stash 37.0
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Results of Sable-3.0.0 vs Stash-37.0 (40+0.4, 1t, 16MB, UHO_4060_v3.epd):
Elo: 35.91 +/- 14.04, nElo: 55.50 +/- 21.53
LOS: 100.00 %, DrawRatio: 45.60 %, PairsRatio: 1.89
Games: 1000, Wins: 390, Losses: 287, Draws: 323, Points: 551.5 (55.15 %)
Ptnml(0-2): [18, 76, 228, 141, 37], WL/DD Ratio: 3.30
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