Stackruns

Run T-0018 passed

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

Hypothesis

Scoring pseudo-legal destination squares for knights, bishops, rooks, and queens should improve move selection by preferring active pieces without duplicating the existing pawn-structure and king-safety terms.

Predecessor set to: T-0018

Stages

Elo against the predecessorElo intervals: short stage +54.24 ± 16.96.0+20+40+60short stage+54.24 ± 16.96short stage · passed+54.24 ± 16.96 Elo · 1,214 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.+54.24 ± 16.96+1,194.89
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.+63.57 ± 19.54+7,659.38 ± 30.89
Games1,214486
Wins / draws / losses564 / 274 / 376485 / 1 / 0
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.53 / 86 / 213 / 130 / 1250 / 0 / 0 / 1 / 242
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).+2.97+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 B
Bench nodes
5,073
Commit
8c162a4f528ce690201282010c624e08e6076395
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.
1239e09ef287629be37ced63a594e0115e9bda6d8b2d13ae9bb0fa279fc15373