Stackruns

Run T-0008 passed

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

Hypothesis

Reducing quiet moves ordered fourth or later by one ply, with a full-depth re-search whenever the reduced null-window probe raises alpha, should trade a small risk of overlooking a good quiet move for a roughly 2.5-fold smaller tree at equal depth, and so reach greater depth in the same thinking time.

Stages

Elo against the predecessorElo intervals: short stage +394.50 ± 47.85; long stage +554.24 ± 57.63.0+100+200+300+400+500+600short stage+394.50 ± 47.85short stage · passed+394.50 ± 47.85 Elo · 326 gameslong stage+554.24 ± 57.63long stage · passed+554.24 ± 57.63 Elo · 506 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.+394.50 ± 47.85+554.24 ± 57.63
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.+668.58 ± 37.71+1,142.67 ± 30.27
Games326506
Wins / draws / losses269 / 53 / 4468 / 36 / 2
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.0 / 2 / 4 / 47 / 1100 / 0 / 3 / 34 / 216
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).+2.96+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
14,492
Commit
010f32fe86fcf453de8d93dc46c35ec63fd77cce
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.
b6961361002164426b32f0d95a4fe3b63cb34d092061a318262cdd5e994a10cc