Stackruns

Run T-0002 passed

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

Hypothesis

Resolving captures at the leaves with a quiescence search capped at six plies should stop the engine from misjudging positions where the recapture lies just beyond the fixed depth, at the price of a larger tree; the bench fingerprint depth was lowered from 4 to 3 to keep a bench run under two seconds.

Stages

Elo against the predecessorElo intervals: short stage +103.02 ± 22.80; long stage +125.62 ± 18.67.0+50+100+150short stage+103.02 ± 22.80short stage · passed+103.02 ± 22.80 Elo · 656 gameslong stage+125.62 ± 18.67long stage · passed+125.62 ± 18.67 Elo · 906 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
Verdictpassedpassed
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.+103.02 ± 22.80+125.62 ± 18.67
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.+127.54 ± 26.59+166.06 ± 22.62
Games656906
Wins / draws / losses315 / 215 / 126452 / 316 / 138
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.15 / 39 / 94 / 102 / 7813 / 41 / 128 / 161 / 110
LLR Log-likelihood ratio, the running evidence of an SPRT. It starts at 0; a stage passes at the upper bound (about +2.94) and fails at the lower one (about −2.94).+2.97+2.95
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, 3.0]
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
Opponent––
Duration––

Provenance

Date
2026-08-28
Author
Agent A
Bench nodes
1,742,071
Commit
2c330558b42ce6457ce9d560d23a994e93575b28
SHA-256 A cryptographic hash. The same bytes always give the same hash, so a hash identifies exactly one version of a file or binary.
2c43434369d201dba547774a6b4fb3e384b7dc4db3c2fe53980a530b1228a435