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A full winning board is classified as a draw · case 04
A full winning board is classified as a draw.
Case contract
Return X or O for the sole winner on a 3x3 board of X/O/dot; otherwise draw if full, playing if not. Inputs never have both winners.
Why this case matters
A deterministic game-rule model isolates this rule interaction for regression testing.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| last square completes row | "draw" | "X" | Failed |
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