FA-83615 / Card game rule engines / Member archive

Vulnerable undoubled undertricks cost 50 · case 05

Vulnerable declarers lose half the penalty.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input [level, strain, doubled(0/1/2), vulnerable, tricks]. Trick score C/D 20, H/S 30, NT 40+30; x2/x4 doubled/redoubled. Game bonus 300/500 when trick score >= 100 else 50 partscore; slam 500/750 (6) or 1000/1500 (7); overtricks trick value undoubled, 100/200 per double level; insult 50 per double level. Undertricks: 50/100 undoubled; doubled NV 100, 200, 200, then 300; doubled V 200 then 300; redoubled x2.

Why this case matters

Card-game engines, scoring apps and online tables apply this rule automatically on every hand.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
duplicate score case 2	`-150`	`-300`	Failed

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