White to move. What is the most affective way to win? 
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1.Nc6! Rxc6
2.Qa4 Qe7
(2…. Rc7
3.Rxc7 a5
4.Qc6+ Kb8
5.Qb7#)
2….Qe7
3.Qxc6+ …
(3.Rxe7 Rc7
4.Rxc7 a5
5.Qc6+ Kb8
6.Qb7#)
3…. Kb8
4.Rxe7 any move
5.Qb7#
by the way – a pratfall would be
1.Qa4? due to
1…. Rxb2+!
2.Kxb2 Qxe5+
and draw by perpetual check
sincerly, Vohaul
Why not Rf8+?
I saw the solution almost instantly…xargon: because of Rc8!
1.Qf8+ Rc8
2.Qxh8! Rxh8
3.Nc6
cute
–Bill Brock
best is
Qf8+ Rcc8
Qg7!
and mate is unstoppable not just material loss.
Qf8+ Rc8
Qg7
1Qf8? Qd8!
2.Qg7 Qb8
and no mate …
sincerly, Vohaul
I am always happy to provide instructive blunders!
Bill Brock
I wouldn’t call Qf8 a blunder as it still wins:
Qf8 Qd8
Qg7 Qb8
h7 bxa5
Rxa7+ Qxa7
Qxh8+ Kb7
Qh7+ followed by Qxa7 and h8 (Q)
never mind Qf8+ is losing
qf8+? qd8!
qg7 qc8!
rxa7 kb8
rb7+ ka8
rxb6 rc7
and still a tough fight, isn’t it?