Run T-0148 rejected

2026-10-01 · Evidence: SPRT Sequential probability ratio test. Games are played until the accumulated evidence reaches one of two bounds; then the test stops.

Hypothesis

In null-window nodes, negamax extends the hash move by two plies instead of one if the singular search stays below singular_beta minus 20 cp and a per-line inherited counter, incremented only on such double extensions, remains below 6. This is expected to make the engine play stronger.

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.	−1.33 ± 3.15
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.	−2.39 ± 5.64
Games	14,582
Wins / draws / losses	3,444 / 7,638 / 3,500
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.	`132 / 1792 / 3489 / 1756 / 122`
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.	−2.95
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 56 min

Provenance

Date: 2026-10-01
Started: 2026-10-01 00:26:43 UTC
Duration: 1 h 57 min
Author: Agent D
Epoch: 6
Gatekeeper: passed
Bench nodes: 4,293