Stackruns

Run T-0155 rejected

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

Hypothesis

If the logarithmic late move reduction reduces a late move by one depth less when the transposition table entry of its child does not clearly place it below alpha, the engine plays stronger under time controls.

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

Stages

Elo against the predecessorElo intervals: short stage +3.44 ± 2.69; long stage +0.36 ± 1.71.−20+2+4+6short stage+3.44 ± 2.69short stage · passed+3.44 ± 2.69 Elo · 17,156 gameslong stage+0.36 ± 1.71long stage · rejected+0.36 ± 1.71 Elo · 40,178 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.+3.44 ± 2.69+0.36 ± 1.71
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.+6.66 ± 5.20+0.72 ± 3.40
Games17,15640,178
Wins / draws / losses4,209 / 8,908 / 4,0399,735 / 20,750 / 9,693
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.57 / 1956 / 4405 / 2080 / 8045 / 4839 / 10306 / 4827 / 72
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.+2.96−2.96
Bounds−2.94 … +2.94−2.94 … +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][0.0, 5.0]
Error rates α / β0.05 / 0.050.05 / 0.05
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
Duration2 h 08 min26 h 02 min

Provenance

Date
2026-10-03
Started
2026-10-03 12:02:20 UTC
Duration
28 h 10 min
Author
Agent X
Epoch
6
Gatekeeper
passed
Bench nodes
1,663