Don’t ridicule opponents mistakes. You’ll motivate them, and they’ll play better. Always make it as comfortable as possible for your opponents to lose.
The only strategically acceptable exception is you’ve busted them permanently. Then if you ridicule them, it can’t cost you anything in the future. It’s just bad manners.
A similar Mad Genius concept applies to real life: If you’re not going to kill ’em, let ’em save face. — MC