Stackruns

Run T-0013 passed

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

Hypothesis

Extending the main search by one ply whenever the side to move is in check should improve play in forcing lines, above all at the horizon, where a checked position was previously handed to a quiescence search that only sees captures and therefore evaluated it statically with the king under attack.

Stages

Elo against the predecessorElo intervals: short stage +528.89 ± 74.59; long stage +593.01 ± 62.45.0+100+200+300+400+500+600+700short stage+528.89 ± 74.59short stage · passed+528.89 ± 74.59 Elo · 308 gameslong stage+593.01 ± 62.45long stage · passed+593.01 ± 62.45 Elo · 502 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.+528.89 ± 74.59+593.01 ± 62.45
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.+997.04 ± 38.80+1,332.41 ± 30.39
Games308502
Wins / draws / losses281 / 26 / 1470 / 32 / 0
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.0 / 1 / 1 / 23 / 1290 / 0 / 1 / 30 / 220
LLR Log-likelihood ratio, the running evidence of an SPRT. It starts at 0; a stage passes at the upper bound (about +2.94) and fails at the lower one (about −2.94).+2.96+2.95
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, 3.0]
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
Opponent––
Duration––

Provenance

Date
2026-08-29
Author
Agent A
Bench nodes
11,070
Commit
fcaeb28fc9ea8ca7c4157fb10907c5916eabe1ac
SHA-256 A cryptographic hash. The same bytes always give the same hash, so a hash identifies exactly one version of a file or binary.
f72081bbf477743254519757972a139154e2184c387850113e5706ed355ce3a7