White to move and win. Black has left his
queen on the same diagonal as the enemy bishop on e3. The
knight, moving away, would "discover" an attack by the bishop on the
queen. The only problem is that White's e3-bishop is
unprotected, so in a sense, the knight is pinned to the bishop, right?
Wrong!
There are actually two ideas about moving the pinned
piece: one is to move it into a position where it would protect the
screened piece (in this position, e.g., Nf5 would provide protection
against ...Qxe3).
The other idea is to move it somewhere where it
creates a threat so powerful that the opponent if forced to respond to
that threat, and so lacks the time to capture the screened piece.
That's what happens in this game:
1.Ne6 Bxe6
The discovered attack allows White to move the knight
with near impunity. Of course the e3-bishop is immune: 1...Qxe3
2.Nbc7 mate!
Leading to much the same thing as the text move is
1...Qa5+ 2.Bd2
2.Bxb6 Bxb2 3.Be3 Nc3
Black's last move prevents White's knight from forking
on c7, mitigating slightly the impact of White's combination.
This is an important lesson too: when on the receiving end of a
combination or attack, it is very important to keep your wits about
you, and look for ways to make your opponents task as difficult as you
can. Lots of lost games can be saved by staying alert, and
fighting all the way!
4.Nxc3 Bxc3+ 5.Kf2 Bxa1 6.Qxa1
After the smoke from all the exchanges clears, we see
that White ends up with a queen for a rook and two pawns, which should
be enough of an advantage to win.
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