Oct 5 Chess Puzzle Question

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oneminus2
Hi guys, I solved today’s chess.com puzzle and missed the last step where I Emma’s supposed to promote the pawn to a rook instead of a queen. Can you tell me why promoting to a rook would be required to solve he puzzle when the queen can do that and more? I’m honing my chess skill so I appreciate the feedback. Thx!
Ofgeniuskind_closed
I honestly do not know pawn to Queen is mate, and why wouldn't you want a mate?
Ofgeniuskind_closed
Well not mate, but a definite advantage.
oneminus2
Hi Ofgeniuskind. Agreed, thanks for the feedback. I’m just curious why promoting to queen is wrong unless it ends in stalemate.
Ofgeniuskind_closed
It doesn't because it is your move, after the knight moves to protect, so you literally can't stalemate and a rook is worthless.
It happens a lot like mate in 13 that nobody would see in a normal game so.
Marvimus

It would end in a stalemate if you promote your pawn to a queen. Knight would move to b8 to block and that would also put white in check. When you move your king out of check, black can't move either piece. 

 

I didn't play it out if you sacrifice your queen to take the knight rather than move your king, but the rook would give you the best possible advantage. 

Ofgeniuskind_closed
I wouldn't have checked in that position in the first place, since it is not necessary so.
WallStrKnight

Yes. I saw it yesterday. A very interesting puzzle. The rook promotion to avoid the knight check and following stalemate is absolutely lovely!