ELO    -7.87 +- 3.97 (95%)
SPRT   10.0+0.10s Threads=1 Hash=16MB
LLR    -1.89 (-2.94, 2.94) [0.00, 2.00]
GAMES  N: 6356 W: 1492 L: 1636 D: 3228
PENTA  [0, 757, 1811, 607, 3]

Eval: Half-move counter inputs (net version 16) Net format version 16 adds 12 feature transformer rows after the piece inputs: bucket b = min(hmc / 8, 12) activates row b - 1 in both perspectives, no row below hmc 8. The incremental update compares the bucket at the two ends of the update path; the accumulator cache stays piece-only and the row is added when a node is built from it. `utils upgradeNet` converts a version 15 net with zero rows, which is an exact no-op (bench 5907427, same as master). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>