Run T-0211 rejected

2026-10-25 · Evidence: SPRT Sequential probability ratio test. Games are played until the accumulated evidence reaches one of two bounds; then the test stops.

Hypothesis

At the null-move gate, if non-PV Principal variation: the line of best moves the search currently expects., not in check, not an exclusion node, and the gate is otherwise met with static eval < beta <= evaluation from the lower bound (or exact), the static veto is removed when depth - r0 >= 2 with r0 = null_move_reduction(depth, 0), setting r = r0. All other conditions, reduction verification, and search parameters remain identical. This change is expected to make the engine play stronger against main.

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

Stages

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 stage
Verdict	rejected
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.	−2.72 ± 3.54
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.	−5.54 ± 7.21
Games	8,930
Wins / draws / losses	1,998 / 4,864 / 2,068
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.	`8 / 1076 / 2373 / 994 / 14`
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.	−2.97
Bounds	−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]
Error rates α / β	0.05 / 0.05
Model	normalized
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+0.08
Book	A
Opponent	vs predecessor
Duration	1 h 07 min

Provenance

Date: 2026-10-25
Started: 2026-10-25 10:13:31 UTC
Duration: 1 h 07 min
Author: Agent D
Epoch: 11
Gatekeeper: passed
Bench nodes: 603