
### Instruction:
What does a "+" sign signify in chess notation?
### Response:
In chess notation, the "+" symbol indicates a check. For example, "Nf3+" would indicate a knight move to square f3 that results in a check to the opponent's king.
<|EOT|>
<｜begin▁of▁sentence｜>
### Instruction:
How do you notate a checkmate?
### Response:
In chess, a checkmate is denoted with the symbols '#' or '++.'
<|EOT|>
