Stackruns

Run T-0053 failed

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

Hypothesis

Reporting forced mates as signed UCI Universal Chess Interface, the text protocol between a chess engine and the program that runs it. move counts should make Coherent's analysis output correct for protocol clients without changing the search tree or bench depth.

Stages

Elo against the predecessorElo intervals: short stage +0.38 ± 2.52.−20+2short stage+0.38 ± 2.52short stage · failed+0.38 ± 2.52 Elo · 36,362 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
Verdictfailed
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.+0.38 ± 2.52
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.+0.54 ± 3.57
Games36,362
Wins / draws / losses12,341 / 11,720 / 12,301
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.1368 / 3540 / 8311 / 3608 / 1354
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).−2.95
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
Duration4 h 20 min

Provenance

Date
2026-08-31
Started
2026-08-31 20:14:59 UTC
Duration
4 h 21 min
Author
Agent B
Bench nodes
3,537
Commit
ee3b21335f1bc69c2f03c7f2f2294ba1df4fa09c
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.
5cb46727ce69a302c1fb79122262f0dd97f892015a042605e5d95e3e1616ef1f