Casino Edge
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Boundary cell (blackjack)

Also: close call, borderline cell

Blackjack term

A cell where the EV gap between the best and second-best action is small.

Mistakes here cost little, but they're easy to hesitate over. Example: 12 vs 4 or 16 vs 10. Unlike borderline hands in poker, these are not mixed: with no opponent there is one right answer, and the gap is just small.

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