Stackruns

Run T-0015 passed

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

Hypothesis

The search now scores threefold repetition, the fifty-move rule and insufficient material as draws, checked before the transposition-table cut because two of the three depend on the path to the position, so the engine should stop repeating won positions into draws and stop valuing material it can never mate with.

Predecessor set to: T-0015

Stages

Elo against the predecessorElo intervals: short stage +43.66 ± 11.71; long stage +954.24 ± 369.98.−1000+100+200+300+400+500+600+700+800+900+1,000+1,100+1,200+1,300+1,400short stage+43.66 ± 11.71short stage · passed+43.66 ± 11.71 Elo · 1,024 gameslong stage+954.24 ± 369.98long stage · passed+954.24 ± 369.98 Elo · 488 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.+43.66 ± 11.71+954.24 ± 369.98
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.+80.24 ± 21.28+3,837.68 ± 30.83
Games1,024488
Wins / draws / losses389 / 374 / 261484 / 4 / 0
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.10 / 54 / 264 / 166 / 180 / 0 / 0 / 4 / 240
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).+2.94+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
Opponentvs predecessorvs reference v0
Duration––

Provenance

Date
2026-08-29
Author
Agent A
Bench nodes
12,058
Commit
1c687a0e64c7d075baed52360a4505f76436c55e
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.
aac91100aead7eef852b17346b24c112f95686f2b4d0c74fcbc6ae1f1db32ba6