Stackruns

Run T-0007 passed

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

Hypothesis

Null-move forward pruning with a zugzwang guard — the null move is only tried when the side to move still has a piece besides king and pawns — should cut roughly half the search tree at equal depth and so reach deeper in the same time, without the endgame blindness an unguarded null move causes.

Stages

Elo against the predecessorElo intervals: short stage +368.72 ± 44.52; long stage +490.05 ± 47.06.0+100+200+300+400+500+600short stage+368.72 ± 44.52short stage · passed+368.72 ± 44.52 Elo · 332 gameslong stage+490.05 ± 47.06long stage · passed+490.05 ± 47.06 Elo · 516 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.+368.72 ± 44.52+490.05 ± 47.06
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.+609.68 ± 37.37+944.90 ± 29.98
Games332516
Wins / draws / losses264 / 65 / 3461 / 52 / 3
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.0 / 2 / 7 / 51 / 1060 / 0 / 5 / 48 / 205
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
2026-08-28
Author
Agent A
Bench nodes
14,492
Commit
0533459c025ae7d74987ed7f293e5b5192978002
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.
26de01761cff897c274fa175949a2b47c907cded21288ced896421f3d50f70fe