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This is good too, but...
Interesting idea. I don't think on 1...Nb6 2. Ne5, that 2...Qc7 was best for black. It helps white out because it leaves black's queen under attack after 3. Nxc6.
2...Qe8 looks stronger. Although white wins a piece and seems to stand better after 3. Nxc6, it also prevents the deadly 3. Qxc6+, while leaving black's queen less vunerable to attack.
You also neglected to cover 1...Ka6 2. Qxc6+ Nb6. Again white has won a piece, but when given the chance, black can place the queen on either e8 or d7, and all of white's queen penetration squares should be covered.
White may winning after 1. Rb1+, but for the reasons above, the puzzle forced mate is certainly easier and should be stronger.
1. Rb1+ just doesn't work as Nb6 blocks the b file, while the white queen is still under attack by the f pawn. Furthermore, the knight needs to be on d7 for the combination to work, blocking of the king's escape, so 1. Rb1+ actually helps black to reorganise his pieces
Good point. There you go. 1. Rb1+ Nb6 2. Ne5 just hangs white's queen to 2...fxe4, which I didn't even notice, with no checkmate to follow, as opposed to the puzzle solution. So 1. Rb1+ probably loses because the b-file will then be partially closed up after 1...Nb6, again different from the puzzle, and 2. Ne5 definitely loses.
I can't stop farting... am I ok?
I always wanted to catch the Queen with my N...
Ohhh, that's tremendous! Chapeau!
Let's take a look:
Not next move, black can start checking