- When a WD4 is played, the victim can challenge or accept
- Challenge succeeds if the WD4 player had a card matching the
previous color — they draw 4 instead
- Challenge fails: victim draws 6 (4 + 2 penalty)
- Bot as victim: challenges probabilistically based on opponent
hand size (10-70% chance, more cards = more likely to challenge)
- Bot as player: 20% chance to illegally play WD4 when it has
matching color cards, making challenges meaningful against it
- Auto-play defaults to accepting (safe option)
- Challenge phase integrates with existing turn timer
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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