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Alena, here is the main line of the puzzle, and the probably the last key decision point before the end:
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.
Oops, I am cutting from my notes, but using your numbering- I forgot to change the 28 to 15.
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.
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.