Engine arena run: completed

Paired contrast slot 0 minus slot 1: -0.012 wins per game over 192 seeds (95% interval -0.072 to +0.048).

Planned: 768
Attempted: 768
Completed: 768
Incomplete: 0
Unplayed: 0

Full retained record and provenance

Run 5b5b528d-de10-4a20-921f-68f1b286d6e9

Status: completed. Experiment: 52780b7c-6067-4d1a-9343-fb9bcc973343. Tier: engine arena (paired seeds, deterministic tapes).

Planned: 768. Attempted: 768. Completed: 768. Incomplete: 0. Unplayed: 0.

Slot / seat	Wins	Completed	Win rate	95% Wilson interval	Mean points	Mean decision
0 / `v2:{"depth":2,"samples":1,"scenarios":8,"inner_scenarios":4}`	271	768	35.3%	32.0%–38.7%	7.62	33.4 ms
1 / `v2:{"depth":2,"samples":4,"scenarios":8,"inner_scenarios":4}`	280	768	36.5%	33.1%–39.9%	7.70	96.0 ms
2 / `eta`	128	768	16.7%	14.2%–19.5%	7.08	0.0 ms
3 / `fast`	89	768	11.6%	9.5%–14.0%	6.77	0.0 ms

Paired contrast slot 0 minus slot 1: -0.012 wins per game over 192 seeds (95% interval -0.072 to +0.048).

Manifest SHA-256: 67a7e53ecedce86f32e33a393774f192c880c15886b1895d2c8883b8f136f7e0. Inventory SHA-256: 627da5bcbb42559f16f2ff30f402e5f8c4d4a70f028883dfacefb849cc8b2ed6.

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.