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Card Game: Find Three Cards Summing to 15

Repair move validation, play legal triples, and improve scores across larger games.

The scenario

Repair move validation, play legal triples, and improve scores across larger games.

A failure to reason about

Use a small search and optimization scenario to compare current behavior with the requirement.

Illustrative context for the topic. The exercise’s full requirements arrive in the workspace.

Questions to bring to your review

  • Which caller makes the reported behavior visible?
  • What focused regression would distinguish the current behavior from the requirement?
  • What existing behavior must remain intact after the change?

Skills you will practice

  • Position identity
  • Combination search
  • State transitions
  • Strategy measurement

Read the existing code, reproduce the reported behavior, review proposed changes, and verify your final implementation. You can use AI assistance while staying responsible for the result.

Prepare with a worked example

See how nrml evaluates an attempt, including the limits of automated evidence.