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Yancey, Here is the critical position where I must find the right move. Am I on the right way?

- Qb1 c1=Q
- fxe7 Qg5
- Qxb2 a1=Q
- Qh2+ Ka8
- Qg2+ Kb8
- Qg3+ Ka8
- Qf3+ Kb8
- Qf4+ Ka8
- Qe4+ Kb8
- Qe5+ Ka8
- Qd5+ Kb8
- Qd6+ Ka8

To make progress after Qd6+ Ka8, white must move the king here. It takes a great leap of imagination to envision how this is won from here, but once you find the thread, some of white's moves are a bit easier to find after that because they are forced by black's own threats.

Yancey, I tried to solve your puzzle again. I had to use all your hints.I think it's the hardest puzzle of all you gave me.

13.Kc7 Qga5+

14.Kc8 Qb1

15.exd8=N Qbb6

16.Qc6+ Ka7

17.Qb7+ Qxb7+

18.Nxb7 Qd5

19.d8=N c3

20.Na5 c2

21.Nac6+ Ka8

22.Nd7 Qb5

23.f8=Q c1=Q

24.Qc5 Qcxc5

25.dxc5 Qb7+

26.Nxb7 g6

27.Nb6#

That is pretty good, Alena. 13. ...Qaa5 14.Kc8 Qgb5 28.ed8(N) c3 is the main line, and most resistant line for black. You should look it over from that point, but you do find the two underpromotions in both lines.

Alena, here is the main line of the puzzle, and the probably the last key decision point before the end:

1.Qh2 Ka8

2.Qg2 Kb8

3.Qg3 Ka8

4.Qf3 Kb8

5.Qf4 Ka8

6.Be4 Ne4

7.Qe4 Kb8

8.Qf4 Ka8

9.Qf3 Kb8

10.Qg3 Ka8

11.Qg2 Kb8

12.Qh2 Ka8

13.Qh1 Kb8

14.Qb1 c1(Q)

15.fe7 Qg5

16.Qb2 a1(Q)

17.Qh2 Ka8

18.Qg2 Kb8

19.Qg3 Ka8

20.Qf3 Kb8

21.Qf4 Ka8

22.Qe4 Kb8

23.Qe5 Ka8

24.Qd5 Kb8

25.Qd6 Ka8

26.Kc7 Qaa5

27.Kc8 Qgb5

28.ed8(N) c3

29.d5 c2

30.Qc6 Qc6

31.Nc6 Qd5

32.d8(N) c1(Q)

33.Nd7 Qcc6

34.Nc6 Qe6 (FEN after 34. ....Qe6 is k1K5/3N1Ppp/p1N1q3/7p/8/8/8/8 w - - 0 1) How should white proceed after 34. ....Qe6? This is the last major part of the puzzle.

You have to let black keep the queen on g5. The queen goes to d6 to protect the e7 pawn- then find the right square for the white king- it isn't c5 or d6.