checkmate is when your king cannot move any or he will get killed
in Arabic checkmate is مات
In chess, there are no rules mandating or prohibiting you from saying "check" or "checkmate" or anything. You do not have to say check or checkmate when making such moves, although it is courtesy. Some people also announce when they promote a pawn, do en passant, or castle. If you say check or checkmate, and you are wrong, then you and the opponent will just laugh it off. If you are continually doing it, your opponent may alert the arbiter to say you're distracting him, but there is no formal rule against this.
No, you do not need to say "checkmate" on the first move. But if you actually checkmate him, say "checkmate" or just "mate" to remind the opponet you won.
It is illegal to move your king into checkmate because that's like the same as moving your king into check, which is not illegal. If they check you, you must go out of check as in game rules. If you go out of check and into check, you must choose a different path and redo that move.
Checkmate in Rio was created in 1964.
Deryni Checkmate was created in 1972.
The population of Checkmate Solutions is 6.
Checkmate Solutions was created in 2003.
You make checkmate when you capture the opponent's king.
Checkmate is worth all of the pieces.
There are many possibilities to get a checkmate in 10 moves, so there is not official "10 turn checkmate".
a false checkmate is when someone calls "checkmate" in a chess game and if you can move without getting out then it is a false checkmate. If they call it you get to go 2 times. :) enjoy your chess game!