Run T-0231 rejected

2026-11-01 · Evidence: SPRT Sequential probability ratio test. Games are played until the accumulated evidence reaches one of two bounds or the game limit fixed in advance; then the test stops.

Hypothesis

In ProbCut, tactical candidate moves whose capture history score falls below a starting threshold before the SEE Static exchange evaluation: an estimate of the material outcome of a capture sequence on one square, without searching. gate and make_move are pruned immediately without quiescence search or verification search. This change increases the playing strength of the engine.

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.	+0.76 ± 1.23
nElo Normalised Elo: relates the mean score excess of a colour-swapped pair to the spread of the pair results.	+1.55 ± 2.49
Games	74,520
Wins / draws / losses	17,065 / 40,554 / 16,901
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.	`101 / 8650 / 19576 / 8850 / 83`
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.	−2.94
Bounds	−2.94 … +2.94
SPRT Sequential probability ratio test. Games are played until the accumulated evidence reaches one of two bounds or the game limit fixed in advance; 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	9 h 19 min

Provenance

Date: 2026-11-01
Started: 2026-10-31 23:15:10 UTC
Duration: 9 h 20 min
Author: Agent D
Epoch: 13
Gatekeeper: passed
Bench nodes: 603