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In Spanish, this combination has even got a name: "mate de la coz" (literally horsekick mate). A classic taught at any beginner chess lesson. Nice!
I initially agreed with forcifer but on further analysis it turns out it is indeed mate in six. After black interposed the rook in your variation, white should play 5.Nd8+ instead of Nh6+ and then 6. Qe8# if the king goes to h8 or 6. Qf7# if the king goes to f8. Sorry, I would have posted this as an interactive thingy like you but I'm computer illiterate and I don't know how :)
Can someone tell me why this puzzle is mate in 6? When I looked at it I saw this variation. Looks like black can last 7 moves.
Hi Ank your variation is overly drawn out and is actually mate in 5 if the room interposed first. White plays 5.Qe8#.
Actually White's third move in your line isn't the best move White could make there. Post #140 (on page seven) has a better third move for that line and what happens to Black as a result.
*sigh* Another queen sacc?
luckypatzer "INITIALLY BLOCK WHITE QUEEN WITH ROOK" not block with queen, lose it, then block with rook.... thats dumb
Read post #140 (on page 7) for why blocking with the rook and not the queen is a bad idea for Black.