Wizard
What happens if a player reneges, failing to follow suit?
The official FAQ gives the penalty, and the rulebook does not cover reneging.
- Wizard Frequently Asked Questions · Official document · 30. What happens if a player reneges (i.e. does not follow suit when required to do so)?
If the mistake is noticed before the next card is played, there is no penalty. If the trick is finished before it is noticed, the other players are credited with their bids and the player who reneged loses 20 points.