- Step 1: The passage opens with the definition of a "game of strategy" in game theory.
- Step 2: It then elaborates on how internal conflicts (within players) and external conflicts (between players) shape the psychological interest in such games.
- Step 3: While detective stories and chess are used as examples, the main thread throughout the passage is explaining how strategy, conflict of interest, and psychological elements relate in game theory.
- Step 4: Hence, the best summary or main idea is option (1).