FA-83719 / Card game rule engines / Member archive

Doubling is offered after a split without DAS · case 04

Split hands can double on tables that forbid it.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input [cards, splits_so_far, from_split_aces, double_after_split]. Split-ace hands may only stand. A total >= 21 may only stand. Otherwise hit; double on two cards if no split yet or DAS allowed; split two cards of equal value if fewer than 3 splits so far; surrender on two cards with no split. Return the action list.

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
actions case 6	`["stand", "hit", "double", "split"]`	`["stand", "hit", "split"]`	Failed

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