"square it occupies IS ATTACKED" Verb, present tense. Present action. Not past action. Present action.
That sentence, that phrase can't get more verby more actiony, more present tense than that.
That's just half of checkmate - check. The piece that checks is not the piece that checkmates!
Of course it is. Unless you want to include friendly pieces that prevent escape as part of the attacking pieces.
The rules say the piece attacking the enemy kings square causes checkmate.
Where does it say that? Or are you just making that up because you desperately want to win this trash argument?
Btw, I want you to quote the definition of checkmating as an action, not checkmate as a position, from the rules. Otherwise your "evidence" is invalid.
4. Objective and Scoring
4A. Checkmate.
The objective of each of the two players in a game of chess is to win the game by checkmating the opponent’s king.
A player’s king is checkmated when the square it occupies is attacked by one or more of the opponent’s pieces and
the player has no move that escapes such attack. See also Rule 12, Check; 12C, Responding to check; and 13A,
Notice the word "attack". That is an active, present action. Because checkmate is a position, it requires an active present attack. Not one from a few moves ago, and certainly not one in the future (the game is over). But a present attack. No mention is ever made of the previous move regarding the attack.
Yes, and the word attack is, in this case, a synonym of check, which is very different from checkmate. You quoted the definition of a checkmate position once again. Congratulations, you don't know the definition of the word "verb"!
You asked for me to quote checkmate as an action. There it is. "square it occupies is attacked". That is action. "IS ATTACKED" Use the dictionary. Look up the words "is" and "attack" and "attacked".
The rules doe not say anything about "was attacked". The rules on checkmate do not care about the previous move, only the present tense. In a checkmate position the ACTION is the attack. Which comes from the ATTACKING piece.