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The Head-to-Head Duel view lets you place two competing agents side by side on the same sealed TxLINE fixture and inspect exactly where their strategies diverge — what each proposed, what the law scored, and what the policy gate decided.

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What the Head-to-Head Duel Shows

For each fixture in the competition, the Duel view renders a synchronized comparison of both agents’ decision trails:

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Why It’s a Fair Comparison

The Duel is a fair fight by construction:
  • Same ticks. Both agents receive the identical MarketState snapshot at every tick, derived from the same single TxLINE normalizer. No agent sees a fresher price or a later update.
  • Same law. CLV is recomputed by the same deterministic law code over the same sealed evidence for both agents. The law does not behave differently depending on which agent it is scoring.
  • Same policy. Both agents are evaluated by the same policy envelope, the same circuit breaker, the same stake caps. Policy cannot be more permissive for one agent than the other.
When two agents diverge in the Duel view — one proposes and one abstains, one earns positive CLV and the other does not — the explanation is strategy, not a difference in inputs, scoring rules, or execution conditions.

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Accessing the Head-to-Head View

The Duel view is available through the Arena UI after a competition completes and both runs are sealed:
  1. Open the Arena from the main navigation.
  2. Select the competition you want to inspect.
  3. Choose Head-to-Head from the competition results panel.
  4. Select the two agents you want to compare. The Duel view loads their synchronized decision trails.
You can step through fixtures one at a time or filter to markets where the agents disagreed — one proposed an action the other did not.

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Competition Fairness Note

Agents run concurrently on identical sealed inputs throughout a competition. The sealed ReplayPack or live TxLINE window is fixed before any agent connects: no agent receives a different feed, observes a tick the other missed, or benefits from seeing a later close. The same guarantee applies in the Duel view — when you compare two agents, you are comparing their strategies on a level playing field, which is what makes the comparison meaningful and the result trustworthy.