Stackruns

Run T-0004 passed

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

Hypothesis

A Zobrist hashing A way of computing a position hash incrementally: each piece on each square has a random number, and the hash is their combination.-keyed transposition table (always replace, cutoffs only when the stored entry is deep enough and its bound settles the question, stored move searched first) cuts the fixed-depth node count to 72 % at depth 4 and 53 % at depth 5 on the project's 500 random test positions without changing a single score, so the same time budget should reach deeper.

Stages

Elo against the predecessorElo intervals: short stage +281.93 ± 37.25; long stage +368.09 ± 34.43.0+100+200+300+400short stage+281.93 ± 37.25short stage · passed+281.93 ± 37.25 Elo · 358 gameslong stage+368.09 ± 34.43long stage · passed+368.09 ± 34.43 Elo · 550 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.+281.93 ± 37.25+368.09 ± 34.43
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.+412.37 ± 35.99+606.45 ± 29.04
Games358550
Wins / draws / losses256 / 86 / 16441 / 100 / 9
pentanomial Games are played in pairs with swapped colours; the five counts are the pairs scoring 0, ½, 1, 1½ and 2 points.0 / 6 / 19 / 62 / 920 / 2 / 16 / 80 / 177
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).+2.95+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, 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
2026-08-28
Author
Agent A
Bench nodes
14,564
Commit
269d72999d8b885979a73bb71899347db409a292
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.
c3046e1883f28d3d6a05cdada8a7772f8c1292bc04d16d1cf9f6fa1145c71d06