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A pawn promotes before reaching its final rank · case 03

A pawn promotes before reaching its final rank.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Piece is pawn/rook/knight; color white/black; rank 1..8; choice queen/rook/bishop/knight. Return choice only for pawn at white rank8 or black rank1; else preserve piece.

Why this case matters

A deterministic game-rule model isolates this rule interaction for regression testing.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
middle rank	`"queen"`	`"pawn"`	Failed

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