Avery Wright

Value-only chess dataset. Each row is a unique board labeled with official Stockfish 19 UCIShowWDL. Use wdl as the value target. Do not treat this as MultiPV policy data. 9,100,000 rows on this repo (append-only waves). Source id 4. Compact move vocab (1968). Shards keep a global index: wave 1 is data/shard000000–000199. Later waves continue. This is SF19's fishtest-LTC self-play WDL model (eval + remaining material). It is not FIDE/Lichess Elo and not a sigmoid of cp. Official WDL is Honor split. split=1 is a 5% holdout. Do not invent a new hash holdout. For value training, use wdl with KL / cross-entropy against a 3-class head ordered win/draw/loss. Drop or keep wdlsource==2 terminals…