Stackruns

Run T-0010 passed

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

Hypothesis

From depth 4 on, each iterative-deepening iteration searches inside a 50-centipawn window around the previous iteration's score and re-searches only the side that fails, so tighter alpha-beta bounds should prune subtrees that the full window searches.

Stages

Elo against the predecessorElo intervals: short stage +476.43 ± 61.46; long stage +604.58 ± 65.00.0+100+200+300+400+500+600+700short stage+476.43 ± 61.46short stage · passed+476.43 ± 61.46 Elo · 314 gameslong stage+604.58 ± 65.00long stage · passed+604.58 ± 65.00 Elo · 502 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.+476.43 ± 61.46+604.58 ± 65.00
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.+868.74 ± 38.43+1,373.08 ± 30.39
Games314502
Wins / draws / losses277 / 36 / 1473 / 28 / 1
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.0 / 1 / 2 / 31 / 1230 / 0 / 1 / 28 / 222
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
2026-08-29
Author
Agent A
Bench nodes
15,533
Commit
e3c12929021e22ea5ca2e9919b39b6cbec738c59
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.
4101190c102d12d8aa51c6060bcfb03440cf7d9f3c7b0dfdff9cf5bf43ef39e1