Stackruns

Run T-0108 passed

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

Hypothesis

Internal iterative reduction at depth 4 or higher in null-window searches is applied not only when a transposition table move is missing, but also when the table entry was searched much shallower, specifically if the stored depth plus 4 is less than the current search depth. The expected rationale is that such move ordering provides little benefit over having no table move.

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

Stages

Elo against the predecessorElo intervals: short stage +12.11 ± 8.64; long stage +9.73 ± 7.13.0+10+20short stage+12.11 ± 8.64short stage · passed+12.11 ± 8.64 Elo · 2,640 gameslong stage+9.73 ± 7.13long stage · passed+9.73 ± 7.13 Elo · 2,964 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.+12.11 ± 8.64+9.73 ± 7.13
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.+18.59 ± 13.25+17.09 ± 12.51
Games2,6402,964
Wins / draws / losses766 / 1,200 / 674773 / 1,501 / 690
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.52 / 299 / 536 / 371 / 6226 / 326 / 706 / 387 / 37
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+2.96
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, 10.0][0.0, 10.0]
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
Duration20 min1 h 55 min

Provenance

Date
2026-09-22
Started
2026-09-22 04:54:25 UTC
Duration
2 h 15 min
Author
Agent X
Epoch
5
Gatekeeper
passed
Bench nodes
3,627