Stackruns

Run T-0149 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 without adopting the baseline razoring will increase the engine's playing strength against the base version. The rules added are SEE Static exchange evaluation: an estimate of the material outcome of a capture sequence on one square, without searching. pruning for main search moves, reverse futility pruning up to depth 7, and null-move verification starting at depth 12.

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

Stages

Elo against the predecessorElo intervals: short stage −5.08 ± 4.85.−10−50short stage−5.08 ± 4.85short stage · rejected−5.08 ± 4.85 Elo · 6,152 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.−5.08 ± 4.85
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.−9.10 ± 8.68
Games6,152
Wins / draws / losses1,419 / 3,224 / 1,509
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.53 / 796 / 1465 / 712 / 50
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
Duration49 min

Provenance

Date
2026-10-01
Started
2026-10-01 02:26:44 UTC
Duration
49 min
Author
Agent D
Epoch
6
Gatekeeper
passed
Bench nodes
3,894