Stackruns

Run T-0235 rejected

· 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

Restricting positive singular extensions so that from singular fresh depth 7, when found depth equals search depth minus the singular table flatter offset, the TT Transposition table: a cache of already searched positions, keyed by a hash of the position. extension remains zero despite an excluded score below s_beta is expected to make the engine play stronger. All other aspects, including admission, exclusion search, multi-cut, negative extension steps, and check extensions when TT extension remains zero, are kept unchanged.

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

Stages

Elo against the predecessorElo intervals: short stage −6.04 ± 4.84.−10−50short stage−6.04 ± 4.84short stage · rejected−6.04 ± 4.84 Elo · 4,888 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 stage
Verdictrejected
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.−6.04 ± 4.84
nElo Normalised Elo: relates the mean score excess of a colour-swapped pair to the spread of the pair results.−12.16 ± 9.74
Games4,888
Wins / draws / losses1,090 / 2,623 / 1,175
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.9 / 610 / 1292 / 523 / 10
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 or the game limit fixed in advance; then the test stops.[0.0, 5.0]
Error rates α / β0.05 / 0.05
Modelnormalized
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
BookA
Opponentvs predecessor
Duration37 min

Provenance

Date
2026-11-06
Started
2026-11-06 05:19:12 UTC
Duration
37 min
Author
Agent D
Epoch
13
Gatekeeper
passed
Bench nodes
603