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1.Rf8+!.
>A-1……N/Bxf8.2.Qf7#
>B-1….Ke7.2.Qxg5+!
>>B1-2…Kxf8.3.Qxd8#
>>B2-2….Kd6.3.Ne4+.Kc7.4.Qxd8#
>>B3-2….Bf6.3.Nf5+.Kxf8.4.Qg8#
>>B4-2….Nf6.3.Nf5+!.Kxf8.4.Qxg7+.Ke8.5.Qf7#
Key was how to activate the pinned N? Remove the pin by capturing the R while maintaining the mating attack!
There is a variation in line B4 which I will post shortly.
Harry
Continuing from my previous post I note that in my B4 line
>>B4 line is not correct solution due to
1.Rf8+.Ke7.2.Qxg5+.Nf6.3.Nf5+.Kd7! When mate will be longer and unsure. (Instead of 3….Kxf8.4.Qxg7+.Ke8. 5.Qf7#).
The correct B4 line that results in mate in 5 is as follows:-
>>B4-1.Rf8+.Ke7.2.Qxg5+.Nf6.3.Rf7+!! Preventing the king from escaping! Now
>>>B41-3…Ke8.4.Qe5+.Qe7.5.Qxe7#
>>>B42-3…Kd6.4.Qf4#!!! The beauty of this last line is that all white pieces are back where they started from ( in this puzzle) while in the meantime black has lost his rook while advancing his N to f6 and his king has reached d6 to be mated!
Harry
1.Rf8+ Ke7
(1… N(or)Bxf8 Qf7#)
2.Qxg5+ options are
(a)2… Bf6
3.Nf5+ Kxf8
4.Qg8#
(b)2…. Nf6
3.Rf7+ Ke8
(3…. Kd6 4.Qf4#)
4.Qe5+ Qe7
5.Qxe7#
(c)2… Kxf8 3.Qxd8#
(d)2…. Kd6
3.Ne4+ Kc7
4.Qxd8#
I first notice that this would be mate in 1 if not white had a rook too many.
So I instinctively play:
1. Rf8 Ke7 (Nxf8/Bxf8? Qf7#)
2. Qxg5+ Kxf8
3. Qxd8#
So I guess:
2. … Kd5 (enforced)
3. Rxd8
without knowing if this is the fastest, but for me it is right know, I have no more time today…
1.Rf8+ Ke7 (1.-Nxf8 or 1.-Bxf8 2.Qf7++)
2.Qxg5+ Nf6
(2.-Kxf8 3.Qxd8++)
(2.-Kd6 3.Nf5+ Kc7 4.Qxd8++)
(2.-Bf6 3.Nf5+ Kxf8 4.Qg8++)
3.Rf7+ Ke8 (3.-Kd6 4.Qf4++)
4.Qe5+ Qe7 5.Qxe7++
1.Rf8+
If Kf8, then Qf7+ mate
1. … Ke7, so no mate in 2 moves
2. Qg5+
If Kf8, then Qd8+ mate
2. …. Bf6
3. Kf5+ Kf8
4. Qg8+ mate in 4
2. …. Kf6
3. Qg7+ Kd6
4. Rd8+ Kd7
5. Rd7+ mate
2. ……. Kd6
3. Nf5+ Kc7
4. Qd8+ mate
Rf8 jumps out immediately as a way to clear the f7 square for the queen:
1. Rf8 Ke7 (Nf8/Bf8 allows Qf7#)
And now it was a question of whether to play Qf7 or Qxg5. One leads to mate, the other leads to a decisive material edge (and force mate probably, but I couldn’t make it work in 5 moves total, so stopped looking). Continuing:
2. Qg5 Nf6 (alternatives follow)
3. Rf7 Ke8 (Kd6 4.Qf4#)
4. Qe5 Qe7
5. Qe7#
Finally, the alternatives at move 2 for black are all shorter mates:
2. …..Bf6 (Kf8 3.Qd8#)
3. Nf5! Kf8
4. Qg8#
Or…
2. …..Kd6
3. Nf5 Kc7 (Ke5 4.Qe3#)
4. Qd8# is a pretty mate.
1.Rf8+ Ke7 2.Qxg5 Nf6 3.Rf7+…(3…Ke8 4.Qe5+ Qe7 5.Qxe7# ) 3…Kd6 4.Ne4+ Nxe4 5.Qf4#
A) Rf8! Ke7
Qg5 Kd6
Ne4 Kc7
Qd8 check mate.
B) Rf8 Ke7
Qg5 Nf6
Qg7 Kd6
Ne4 check mate.
C) Rf8 Ke7
Qg5 Bf6
Nf5 Kf8
Qg8 check mate!
1 Rf8+ Bf8 or Nf8
2 Qf7#
1 Rf8+ Kf8
2 Qd8#
1 Rf8+ Ke7
2 Qg5+ Kf8
3 Qd8#
1 Rf8+ Ke7
2 Qg5+ Bf6
3 Nf5+ Kf8
4 Qg8#
1 Rf8+ Ke7
2 Qg5+ Nf6
3 Rf7+ Kd6
4 Qf4#
1 Rf8+ Ke7
2 Qg5+ Kd6
3 Ne4+ Kc7
4 Qd8#
1 Rf8+ Ke7
2 Qg5+ Nf6
3 Rf7+ Ke8
4 Qe5+ Qe7
5 Qe7#
Is there a mate in 2?
1. Rf8+ Bxf8
2.Qf7++
or
1.Rf8+ Nxf8
2.Qf7++
Or am I missing something obvious?