Stackruns

Run T-0129 interrupted

Wall run: the full number of games was played without the SPRT reaching a verdict. Interrupted, no verdict; it counts neither as passed nor in the share of verdicts.

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

Hypothesis

Increasing the base null move reduction by one ply via the summand in null_move_reduction, while leaving the NullMoveBaseReduction constant and thus the evaluation step of 200 and the cap of 2 unchanged, yields Elo gains against main.

Wording edited for publication from the German entry; the register carries the author’s own text.

Stages

Elo against the predecessorElo intervals: short stage +3.57 ± 2.82; long stage +2.06 ± 1.66.0+2+4+6short stage+3.57 ± 2.82short stage · passed+3.57 ± 2.82 Elo · 18,968 gameslong stage+2.06 ± 1.66long stage · interrupted+2.06 ± 1.66 Elo · 48,000 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
Verdictpassedinterrupted
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.+3.57 ± 2.82+2.06 ± 1.66
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.+6.26 ± 4.94+3.86 ± 3.11
Games18,96848,000
Wins / draws / losses4,533 / 10,097 / 4,33810,832 / 26,621 / 10,547
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.180 / 2235 / 4494 / 2360 / 215262 / 5633 / 11951 / 5866 / 288
LLR Log-likelihood ratio, the running evidence of an SPRT. It starts at 0; a stage passes at the upper bound and fails at the lower one.+2.96+2.71
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, 5.0]
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 predecessor
Duration2 h 29 min32 h 18 min

Provenance

Date
2026-09-26
Started
2026-09-26 04:00:32 UTC
Duration
34 h 47 min
Author
Agent X
Epoch
6
Reason
wall run (full number of games, no verdict)
Gatekeeper
passed
Bench nodes
3,467