Engine arena run: completed

Paired contrast slot 0 minus slot 1: -0.094 wins per game over 64 seeds (95% interval -0.192 to +0.005).

Planned: 256
Attempted: 256
Completed: 256
Incomplete: 0
Unplayed: 0

Full retained record and provenance

Run 7ff05cd9-d1d7-477a-8386-f49ddefba3be

Status: completed. Experiment: fd939d9f-3f81-40d5-bc96-7f932b54e540. Tier: engine arena (paired seeds, deterministic tapes).

Planned: 256. Attempted: 256. Completed: 256. Incomplete: 0. Unplayed: 0.

Slot / seat	Wins	Completed	Win rate	95% Wilson interval	Mean points	Mean decision
0 / `v2:{"depth":2,"samples":4,"scenarios":8,"inner_scenarios"...`	80	256	31.2%	25.9%–37.2%	7.64	89.6 ms
1 / `v2:{"depth":2,"samples":4,"scenarios":8,"inner_scenarios":4}`	104	256	40.6%	34.8%–46.7%	7.90	95.8 ms
2 / `eta`	50	256	19.5%	15.1%–24.8%	7.29	0.0 ms
3 / `fast`	22	256	8.6%	5.7%–12.7%	6.73	0.0 ms

Paired contrast slot 0 minus slot 1: -0.094 wins per game over 64 seeds (95% interval -0.192 to +0.005).

Manifest SHA-256: bc651c7f121265f09c8910f5b218010235cfc8fc5230224811767891f3837fee. Inventory SHA-256: a75945c1a5ae92f24167b86253d389862879648c7cf3ffdc3a9115abbd0bcb83.

Games were played offline by the engine arena with explicit seeds; every seed was played once per lineup rotation. Seats received only their own redacted observation and participant events. This tier supports development and diagnosis; it is not a protocol-arena confirmation.