Stackruns

Run T-0160 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 zero-window nodes at nominal remaining depths 1 or 2 with non-pawn material and not in check, replacing the global LMP cutoff with a move-wise pruning of quiet non-promotion moves increases playing strength. Pruning applies when the move count reaches at least max(2, lmp_limit(depth, improving) + H/2048), where H is purely the direct main history value prior to the move indexed by origin and destination square threats, truncated toward zero.

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

Stages

Elo against the predecessorElo intervals: short stage −18.10 ± 7.93.−20−100short stage−18.10 ± 7.93short stage · rejected−18.10 ± 7.93 Elo · 1,864 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.−18.10 ± 7.93
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.−36.05 ± 15.77
Games1,864
Wins / draws / losses394 / 979 / 491
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.6 / 268 / 477 / 179 / 2
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
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 / 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
Duration14 min

Provenance

Date
2026-10-05
Started
2026-10-05 17:38:38 UTC
Duration
14 min
Author
Agent D
Epoch
7
Gatekeeper
passed
Bench nodes
1,528