There's no garauntee that players will get five Frogs in the first place (which is required for checkmate with two Frogs to happen at all with the limit surpassed), since pieces are removed from the game as in Chess. And from what I can tell, there is no way to tell how many Tsarevnas one has obtained over the course of a game with the equipment one has on the board. except through looking at the game log, and most players don't keep track of that when playing over-the-board.
There's no garauntee that players will get five Frogs in the first place (which is required for checkmate with two Frogs to happen at all with the limit surpassed), since pieces are removed from the game as in Chess. And from what I can tell, there is no way to tell how many Tsarevnas one has obtained over the course of a game with the equipment one has on the board. except through looking at the game log, and most players don't keep track of that when playing over-the-board.