What is the most efficient checkmate?


If you mean what is the FASTEST checkmate then it might be Legal's Mate. You can look that one up. But this one I stumbled upon yesterday was pretty fast. BTW, Stockfish told me it could have been a move faster. All I wanted to do was take the Knight so the OP would be double-pawned. I didn't even see the revealed check. I'm only a 450-500 player!
https://www.chess.com/game/live/138347417954?move=0

Sorry, I guess mine wasn't even a checkmate - the OP actually just resigned when I took their queen!

A queen and a knight if you still have it, otherwise two rooks trapping the king, or a rook and a queen like someone said, but that depends?