The opportunity to take free material, like a hanging piece or pawn.
What is a Miss in chess?

Theres mistakes, then misses, then blunders. So what is a miss exactly?
- New Miss Classification - Sometimes a move is bad not because something went horribly wrong with your own position, but because you failed to punish your opponent’s bad move. For example: you’re in an even game, your opponent gives you the opportunity to fork and win a piece, but you just make a normal continuing move as if nothing happened. These cases will be covered by a new classification called Miss,
Theres mistakes, then misses, then blunders. So what is a miss exactly?