Chess engine: Stockfish 22122106 NNUE for Windows and Linux (+3.38)

Stockfish 22122106 - UCI chess engine, compiled by Linmiao Xu
Rating CEDR=3748

Timestamp: 1671603298

Update default net to nn-335a9b2d8a80.nnue

Created by retraining the master net with a combination of:

the previous best dataset (Leela-dfrc_n5000.binpack), with about half the dataset filtered using depth6 multipv2 search to throw away positions where either of the 2 best moves are captures

Leela T80 Oct and Nov training data rescored with best moves, adding ~9.5 billion positions

Trained effectively the same way as the previous master net:

python3 easy_train.py \

--experiment-name=leela-dfrc-filtered-T80-oct-nov \

--training-dataset=/data/leela-dfrc-filtered-T80-oct-nov.binpack \

--start-from-engine-test-net True \

--gpus="0," \

--start-lambda=1.0 \

--end-lambda=0.75 \

--gamma=0.995 \

--lr=4.375e-4 \

--tui=False \

--seed=$RANDOM \

--max_epoch=800 \

--auto-exit-timeout-on-training-finished=900 \

--network-testing-threads 20 \

--num-workers 6

Local testing at a fixed 25k nodes:

experiments/experiment_leela-dfrc-filtered-T80-oct-nov/training/run_0/nn-epoch779.nnue

localElo: run_0/nn-epoch779.nnue : 4.7 +/- 3.1

The new Leela T80 part of the dataset was prepared by downloading test80 training data from all of Oct 2022 and Nov 2022, rescoring with syzygy 6-piece tablebases and ~600 GB of 7-piece tablebases, saving best moves to exported .plain files, removing all positions with castling flags, then converting to binpacks and using interleave_binpacks.py to merge them together. Scripts used in this data conversion process are available at:

https://github.com/linrock/lc0-data-converter

Filtering binpack data using depth6 multipv2 search was done by modifying transform.cpp in the tools branch:

https://github.com/linrock/Stockfish/tree/tools-filter-multipv2-no-rescore

Links for downloading the training data (total size: 338 GB) are available at:

https://robotmoon.com/nnue-training-data/

Passed STC:

LLR: 2.94 (-2.94,2.94) <0.00,2.00>

Total: 30544 W: 8244 L: 7947 D: 14353 Elo +3.38

Ptnml(0-2): 93, 3243, 8302, 3542, 92

https://tests.stockfishchess.org/tests/view/63a0d377264a0cf18f86f82b

Passed LTC:

LLR: 2.95 (-2.94,2.94) <0.50,2.50>