White to move and win
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mate in 3
I've solved it: Qxa7+ Kxc6; Na5+ Kb5(the only move); a4#
benws wrote: What about 1...Kb5?
Right!!! There is one more variation starting with 1.Qxa7+ Kb5 .
Eugen wrote:
I've solved it: Qxa7+ Kxc6; Na5+ Kb5(the only move); a4#
You are right. Try to find one more variation.
1. Qxa7+ Kb5
2. a4 Kxc6
3. Na5#
or
1. Qxa7+ Kb5
2. a4 Kc4
3. Qa6#
Locke wrote: 1. Qxa7+ Kb52. a4 Kxc63. Na5#
or
1. Qxa7+ Kb52. a4 Kc43. Qa6#
or
1. Qxa7+ Kb52. a4 Kc43. Qa6#
The black king doesn't move to 2...Kxc6 because there is no way to live.
1. Qxa7+ Kb5
2. a4 Kc4
3. Qa6# -> This is not a checkmate.
The black king gets the white knight at b3 and live more life as stated below.
1. Qxa7+ Kb5 2. a4+ Kc4 3. Qa6+ Kxb3
I got it! 1. Qxa7+ Kb5 2. c4+! Kxc4 3. Qa6#. Or 2. c4+ Kxc6 3. Na5#. I think I got it! finally solved the puzzle! 
benws wrote: I got it! 1. Qxa7+ Kb5 2. c4+! Kxc4 3. Qa6#. Or 2. c4+ Kxc6 3. Na5#. I think I got it! finally solved the puzzle!
At last, you got it!!! c4+ is a quite hard to think.
But. only first solution of your 2 solutions is right.
1. Qxa7+ Kb5 2. c4+! Kxc4 3. Qa6#.
The white move 3. Na5# in your second solution is not a checkmate
because the black king can move to Kd3 to avoid checkmate.
Don't forget that the white pawn at c2 has been already caught.
Thank you for participating in this puzzle.
Thank you, everyone.
