Review of 2026-09-26T0725Z-h289-board-margin

Owner lane: Not recorded

Finding and verdict

UPHELD

Review scope

Every falsifiable number in the record reproduces exactly, and the finding survives a harsher shuffled-outcome attack than the frozen protocol itself required. Record's own verdict stands unweakened: on 816 REG games 2023-25, the market-free HEAD board's summed margin is +1.08 [+0.68,+1.47] pts/game worse than the close (Bonf-6), 53% as dispersed, and its disagreement with the close carries nothing the close lacks (encompassing slope -0.17 [-0.39,+0.07], spans 0). A teamstate TD-scale (arm B) closes 37% of the gap against a predeclared 50% bar -- correctly reported as P4 MISS, not swept into a pass.