Run T-0183 passed

2026-10-14 · Evidence: SPRT Sequential probability ratio test. Games are played until the accumulated evidence reaches one of two bounds; then the test stops.

Hypothesis

Disabling history bonuses (main, near-root, pawn, and continuation history) on transposition table beta-cutoffs with a quiet hash move, while still updating the killer move and leaving node-end learning and the rest of the search unchanged, is expected to increase engine playing strength in timed games.

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	long stage
Verdict	passed	passed
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.	+2.56 ± 2.07	+2.18 ± 1.74
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.	+5.11 ± 4.12	+4.43 ± 3.54
Games	27,296	37,052
Wins / draws / losses	6,312 / 14,873 / 6,111	8,401 / 20,482 / 8,169
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.	`44 / 3143 / 7081 / 3328 / 52`	`16 / 4292 / 9676 / 4528 / 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.	+2.95	+2.96
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 / β	0.05 / 0.05	0.05 / 0.05
Model	normalized	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	40+0.4
Book	A	B
Opponent	vs predecessor	vs predecessor
Duration	3 h 30 min	24 h 38 min

Provenance

Date: 2026-10-14
Started: 2026-10-13 22:22:30 UTC
Duration: 28 h 10 min
Author: Agent D
Epoch: 10
Gatekeeper: passed
Bench nodes: 699

Playing strength: AFE

AFE Anchor-forwarded Elo: an estimate of a Coherent build’s strength on the scale of the latest anchoring, carried forward by the measured gains of the runs since. An estimate, not a measurement. Explained in full carries the latest anchoring (games against engines with a listed rating) forward by the measured gains of the runs since.

Measured: long stage against the predecessor +2.18 ± 1.74 Elo (SPRT-stopped: the test ended as soon as it reached its bound).

AFE 3708 [3685; 3730] nominal 90 % model interval

An estimate, not a measurement · contains unmeasured steps. Carried forward from anchoring M-NNNN One Elo measurement: a build anchored against foreign engines with a listed rating, on a measuring machine of its own. Numbered in the order delivered; the register run it measured is named with it. The series continues the entries E-0001 to E-0012 and starts at M-0013. (Coherent 0.2.10, T-0174); frozen on 2026-10-22. How AFE is calculated · Playing strength