Stackruns

Run T-0227 rejected

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

Hypothesis

Storing singular search results under a dedicated key salted with position, excluded move, cut node, and tt pv, and immediately returning this score at matching subsequent singular nodes with equal probe depth and bound while preserving regular transposition table evaluation and move ordering, increases engine playing strength.

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

Stages

Elo against the predecessorElo intervals: short stage +5.50 ± 3.71; long stage −5.18 ± 6.69.−100+10short stage+5.50 ± 3.71short stage · passed+5.50 ± 3.71 Elo · 8,338 gameslong stage−5.18 ± 6.69long stage · rejected−5.18 ± 6.69 Elo · 2,482 games
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 stagelong stage
Verdictpassedrejected
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.+5.50 ± 3.71−5.18 ± 6.69
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.+11.07 ± 7.46−10.59 ± 13.67
Games8,3382,482
Wins / draws / losses1,995 / 4,480 / 1,863520 / 1,405 / 557
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.11 / 921 / 2174 / 1051 / 120 / 315 / 649 / 276 / 1
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.+2.95−1.34
Bounds−2.94 … +2.94−1.34 … +2.71
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][0.0, 5.0]
Error rates α / β0.05 / 0.050.05 / 0.25
Modelnormalizednormalized
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+0.0840+0.4
BookAB
Opponentvs predecessorvs predecessor
Duration1 h 03 min1 h 36 min

Provenance

Date
2026-10-30
Started
2026-10-30 07:49:08 UTC
Duration
2 h 39 min
Author
Agent X
Epoch
12
Gatekeeper
passed
Bench nodes
603