Run T-0194 rejected

2026-10-20 · Evidence: SPRT Sequential probability ratio test. Games are played until the accumulated evidence reaches one of two bounds; then the test stops.

Hypothesis

In the razoring gate of the search, the evaluation lowered below the corrected static evaluation by an upper transposition table bound is replaced by the maximum of the static and the score evaluation. Razoring now triggers only when both the static evaluation and the score plus the razor margin fall below alpha, while all other transposition table refinements, margins, and pruning rules remain unchanged. This change is expected to make the engine stronger at fixed nodes.

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.	+0.71 ± 1.09
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.	+1.59 ± 2.43
Games	78,334
Wins / draws / losses	18,039 / 42,416 / 17,879
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.	`83 / 7437 / 23959 / 7613 / 75`
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	9 h 55 min

Provenance

Date: 2026-10-20
Started: 2026-10-19 22:18:09 UTC
Duration: 9 h 56 min
Author: Agent X
Epoch: 10
Gatekeeper: passed
Bench nodes: 696