Stackruns

Run T-0224 rejected

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

Hypothesis

In reverse futility pruning, the fixed reduction RfpGegner when gegner_schwaecher holds is replaced by min(RfpGegner, statisch + vor1). When vor1 is invalid or the sum is at most zero, no reduction is applied. If all other search parameters, including RfpFaktor, RfpSteigend, the null-clamp, and null move pruning, remain unchanged, the engine is expected to play stronger.

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

Stages

Elo against the predecessorElo intervals: short stage +2.31 ± 1.85; long stage +0.44 ± 2.30.−20+2+4short stage+2.31 ± 1.85short stage · passed+2.31 ± 1.85 Elo · 33,452 gameslong stage+0.44 ± 2.30long stage · rejected+0.44 ± 2.30 Elo · 20,376 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.+2.31 ± 1.85+0.44 ± 2.30
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.+4.64 ± 3.72+0.92 ± 4.77
Games33,45220,376
Wins / draws / losses7,767 / 18,140 / 7,5454,508 / 11,386 / 4,482
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.36 / 3875 / 8688 / 4085 / 428 / 2337 / 5468 / 2371 / 4
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.+2.96−1.34
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
Duration4 h 11 min13 h 05 min

Provenance

Date
2026-10-28
Started
2026-10-27 23:37:17 UTC
Duration
17 h 17 min
Author
Agent D
Epoch
12
Gatekeeper
passed
Bench nodes
607