Yes. If you have your opponents king under threat, you have to say check. If you have their king in a position to take it and they have no move left to save it, you say checkmate.
No, you don't have to say check or checkmate. I used to play in USCF tournaments and we never did.
No, you do not have to say "check" before taking the king in chess.
In chess, you say "check" when your opponent's king is in a position to be captured on the next move.
Yes, in chess, it is customary to say "check" when putting the opponent's king in danger.
No, you do not need to say "check" when you put your opponent's king in danger in chess.
No, it is not required to say "check" when putting your opponent's king in check during a game of chess.
Yes, in chess, you say "check" when you threaten the opponent's king with capture on the next move.
No, you do not have to say "check" when you put your opponent's king in danger in chess. It is not a required rule, but some players choose to say it as a courtesy to their opponent.
No, in chess, you do not have to say "check" when putting the opponent's king in a position of threat. It is not a required rule, but it is a common practice to alert your opponent that their king is in danger.
No, failing to say "check" when putting your opponent's king in danger does not result in an automatic loss in chess. It is not a rule in the game to verbally announce "check."
If you don't say "check" in chess when putting your opponent's king in danger, your opponent may not realize their king is in danger and may not make a move to protect it. This could lead to confusion and potentially unfair gameplay. Saying "check" is a common courtesy in chess to alert your opponent that their king is in danger.
Yes, in chess, when you put your opponent's king in a position where it is under threat of capture, you are supposed to say "check" to alert your opponent.
No, in chess, there is no requirement to say "check" when putting the opponent's king in check. It is not a rule, but some players may choose to do so as a courtesy.