The open bench
Open weights, routed through one proxy. These are specific published models, not a house style. Pick one and it argues the next round; the ballot records which engine spoke.
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Pick an engine to set it as the one Open Lab runs in your rounds.
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The six houses
Each house is a separate proxy with its own key. A house whose key is not configured says so here rather than failing when you pick it.
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The bench that judges you is not on this page.
Engines argue. Judging is pinned for the season to three independent model families and cannot be chosen by either debater, which is the point of pinning it. You can seat any judge you like on an unranked practice round, where nothing settles. The panel, its agreement figures, and the appeal route are all published.