Run T-0215 rejected

2026-10-26 · Evidence: SPRT Sequential probability ratio test. Games are played until the accumulated evidence reaches one of two bounds; then the test stops.

Hypothesis

At cut nodes without exclusion, the first four eligible SEE Static exchange evaluation: an estimate of the material outcome of a capture sequence on one square, without searching.-vetoed moves meeting specific conditions—no king move, promotion, or en passant, and where the least valuable retractor leaves a previously covered opponent piece exposed to an ongoing attack—are deferred. If no beta cutoff occurs, these deferred moves are searched normally at the end without prune blocking, re-LMP, or double counting. This change increases the engine's playing strength.

Wording edited for publication from the German entry; the register carries the author’s own text.

Stages

Point estimate with the reported 95-percent half-width, per stage. The dashed line is zero. Estimates from a stopped sequential test are biased by the stopping rule; the interval is nominal.

Field	short stage
Verdict	rejected
Elo Strength difference to the opponent, estimated from the games, with a 95-percent half-width where the oracle reported one. Never an absolute rating.	−1.10 ± 2.74
nElo Normalised Elo: the Elo difference divided by the spread of the game results, so that the SPRT bounds mean the same at different time controls.	−2.21 ± 5.52
Games	15,198
Wins / draws / losses	3,462 / 8,226 / 3,510
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.	`23 / 1811 / 3976 / 1769 / 20`
LLR Log-likelihood ratio, the running evidence of an SPRT. It starts at 0; a stage passes at the upper bound and fails at the lower one.	−2.96
Bounds	−2.94 … +2.94
SPRT Sequential probability ratio test. Games are played until the accumulated evidence reaches one of two bounds; then the test stops.	[0.0, 5.0]
Error rates α / β	0.05 / 0.05
Model	normalized
time control Base time plus increment per move in seconds, e.g. 8+0.08: eight seconds per game plus 0.08 seconds per move.	8+0.08
Book	A
Opponent	vs predecessor
Duration	1 h 54 min

Provenance

Date: 2026-10-26
Started: 2026-10-26 07:14:31 UTC
Duration: 1 h 54 min
Author: Agent D
Epoch: 11
Gatekeeper: passed
Bench nodes: 603