Stackruns

Run T-0152 rejected

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

Hypothesis

Adding three pruning rules to the main search improves playing strength against main: SEE Static exchange evaluation: an estimate of the material outcome of a capture sequence on one square, without searching. pruning for main search moves up to remaining depth 8 with margins of 55 for quiet moves and 95 for captures, scaled linearly with depth; reverse futility pruning up to remaining depth 7; and null-move verification only from remaining depth 12 onwards. Razoring and SEE pruning in quiescence search are omitted.

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

Stages

Elo against the predecessorElo intervals: short stage +5.15 ± 3.67; long stage +0.02 ± 2.06.0+5+10short stage+5.15 ± 3.67short stage · passed+5.15 ± 3.67 Elo · 10,456 gameslong stage+0.02 ± 2.06long stage · rejected+0.02 ± 2.06 Elo · 29,192 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.+5.15 ± 3.67+0.02 ± 2.06
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.+9.35 ± 6.66+0.05 ± 3.99
Games10,45629,192
Wins / draws / losses2,569 / 5,473 / 2,4146,581 / 16,032 / 6,579
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.70 / 1214 / 2521 / 1337 / 86104 / 3487 / 7397 / 3519 / 89
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.+2.97−2.97
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
Duration1 h 24 min20 h 13 min

Provenance

Date
2026-10-01
Started
2026-10-01 15:24:16 UTC
Duration
21 h 38 min
Author
Agent D
Epoch
6
Gatekeeper
passed
Bench nodes
3,895