Stackruns

Run T-0003 passed

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

Hypothesis

Sorting captures by MVV-LVA ahead of quiet moves at every node makes alpha-beta cut off far earlier - the same fixed-depth scores are reached with 45x to 381x fewer nodes across twelve positions at depths 1 to 3 - so within a fixed time budget the engine should search materially deeper.

Stages

Elo against the predecessorElo intervals: short stage +241.11 ± 33.11; long stage +299.70 ± 28.40.0+100+200+300short stage+241.11 ± 33.11short stage · passed+241.11 ± 33.11 Elo · 378 gameslong stage+299.70 ± 28.40long stage · passed+299.70 ± 28.40 Elo · 582 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.+241.11 ± 33.11+299.70 ± 28.40
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.+347.39 ± 35.02+471.86 ± 28.23
Games378582
Wins / draws / losses248 / 109 / 21426 / 136 / 20
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.0 / 7 / 32 / 66 / 840 / 3 / 33 / 101 / 154
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
Opponent––
Duration––

Provenance

Date
2026-08-28
Author
Agent A
Bench nodes
15,167
Commit
c5bf3fbb89b7d27cbdfcd16d1110c410a367c6a8
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.
650dde7644aa48dfa0e18ca5317c8b1498cc369e469ed487cbd7873f6ab9f325