Stackruns

Run T-0193 rejected

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

Hypothesis

Disabling the null-move pruning solely when the side to move has only knights besides king and pawns, with at least one knight and every knight being absolutely pinned to its king, increases playing strength at fixed node limits compared to the baseline. All other null-move conditions, reductions, mate pruning, verification, side-to-move restrictions, and the remaining search stay 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 −1.99 ± 2.87.−4−20short stage−1.99 ± 2.87short stage · rejected−1.99 ± 2.87 Elo · 9,764 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.−1.99 ± 2.87
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.−4.79 ± 6.89
Games9,764
Wins / draws / losses2,185 / 5,338 / 2,241
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.9 / 840 / 3238 / 788 / 7
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
Duration1 h 14 min

Provenance

Date
2026-10-20
Started
2026-10-19 21:01:04 UTC
Duration
1 h 14 min
Author
Agent D
Epoch
10
Gatekeeper
passed
Bench nodes
696