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Dear phdI have posted my reply to your comment on July 18.Please go through it.
1.Rc7+ is the move!Main Line1. Rc7+ Kxe62. Rh6+ Kf53. Rf7+ Kg54. Rg6+ Kh45. Rh7# 1st move variants1A1. Rc7+ Kf62. Rh6+ Kf53. Bd3# 1B - very interesting and most challenging!1. Rc7+ Kd62. Rxe8 Nc3+3. Kc2 a1=N+4. Kd3 Any move5. Nf7# 1CA1. Rc7+ Nd72. Rxd7+ Kf63. Rh6+ Kf54. Bd3# 1CB1. Rc7+ Nd72. Rxd7+ Kxe63. Bh3+ Kf64. Rf7+ Kg55. Rf5# 3rd move variant1. Rc7+ Kxe62. Rh6+ Kf53. Rf7+ Ke44. Rh4# Harry
I got it straight.I don't know if there is a catch.1.Rc7+ Kxe6(1.....Nd7 2.Rxd7+ Kxe63.Bh3+ kf54.Rf7+ kg55.Rf5#)2.Rh6+ Kf53.Rf7+ Kg54.Rg6+ Kh45.Rh7#In both cases 3.... Ke4 4.Rh4#
The critical line is 1.Rc7 Kd6. In that line, there is some careful play that white must do with his king to evade checks long enough to mate with the knight from f7.
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