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A common rook and king checkmate pitfall
There’s a mate in 2.
Yes, there is mate in 2 with the most obvious moves.
What's even worse: in the given solution, Rf1 Rf2, Rf3, Rf4 are just as good as Rf5, but they are called "incorrect".
It would be very difficult to construct a worse puzzle.
"What's even worse ..."
To be fair, he does point that out in the comments. With the chess.com puzzle interface that seems to be the only option (apart from getting the moves right in the first place, when the problem wouldn't occur).
Probably the most beautiful King-and-Rook mate puzzle is the Saavedra position.
For pedagogical purposes, I'll just post it as a variation, not as a puzzle:
There’s a mate in 2.
Yes, there is mate in 2 with the most obvious moves.
What's even worse: in the given solution, Rf1 Rf2, Rf3, Rf4 are just as good as Rf5, but they are called "incorrect".
It would be very difficult to construct a worse puzzle.
Yes, I see the mate in 2 now. And I also see why I don't bother. You act so condescending and toxic all the time, yet you wonder why no one wants to learn this game.
Newsflash: If a community is unwelcoming, people generally won't stay. Also, I'm not an idiot just because I made a mistake. 🤷🏻♂️
Worth noting that all versions of Stockfish routinely fail to find fastest mates or most obstinate defences in KRvK.
As for a worse puzzle, see https://www.chess.com/terms/checkmate-chess#king-and-one-rook where chess.com manages to take 11 moves over a mate in 4.
This checkmate can be a little confusing, but some potential setups can be more confusing than others.
Below is what seems to be the one that trips people up the most. I've made it into a puzzle to explain how to mate here.
White to move. Mate in 3 moves.