White already has a huge advantage, with his extra,
passed, king-side pawns, but advancing them could prove difficult with
his king somewhat exposed, and the black queen on the lose. The
first move of the combination, a discovered check, is pretty easy to
find:
1.f7+ Kh7
If instead
1...Bg7 then 2.f8Q+ wins, as the bishop is pinned!
Analysis Diagram: after 2.f8=Q+
Back to
the game now...
2.Qf5+
Forcing the king back onto a dark square...
2...Kg7
...setting it up for yet another check. 2...Kh8 3.Qf6+ Kh7 4.g6+
leads to the same position as in the line shown below.
3.Qf6+
Now things are just as White wants them. The queens are aligned
on the same diagonal, with a pawn screening them from each other.
Better yet, the king has only one square to go to. When your
opponent's replies are forced, it makes calculating lines much easier!
3...Kh7 4.g6+
The pawn move discovers an attack by the white queen against the black
queen. The king has to move (remember: priority of check) and so
Black has no time to save the queen, as he MUST get out of check.
After the king moves out of check, White wins easily, as he will be
ahead a queen for a bishop.
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