Ok I made a mistake.
The game harness was doing a lot of heavy lifting for both models by preparing optimal options for Jev/Haiku to pick from, given a game state.
If I change the harness to provide only game rules and game state, and only allow Jev to decide the control buttons (left/right/rotate/drop), it pretty much becomes useless.
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Tetris battle: Jev vs Claude Haiku 4.5
Both compete in REAL TIME.
This means both SPEED and INTELLIGENCE matter.
(Link to try it yourself below)