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1.Qg3 g6 forced
2.Bxc6 Bxc6
3.Qe5 f6
4.Qxe7 wins a piece.
Order of moves is important .1.Bxc6 fails.
1. Qg3 g6
Now the f6 square is no longer protected by a black pawn, which allows
2. Bxc6 Qxc6 (or Bxc6)
3. Qe5
Black loses material because of a double attack on the bishop and mate on g7
Nice, simple chess… and perhaps easy to miss. By the way, Botvinnik would not call this a combination, because no sacrifice is involved. We’ll have to call it a three-part, forced manoeuvre!
Black must surrender a piece to avoid forced mate.
1. Qg3 g6
2. Nd5
White threatens 3. Nxg6 hxN 4. Qxg6 mate.
2. … Qf5
If 2. … NxN then after 3. Qxd5 mate is inevitable.
3. NxN BxN
4. BxB
1.Qg3 g6
2.Bxc6 Bxc6
(if 2….Qxc6
than 3. Qe5 f6
4.Qxe7 ++)
3.Qe5 f6
4.Qxe7 Rce8
5.Qxc5
In last comment I blunded 1.Qg3 Nd4.
Well, Let’s see
1.Qg3 Nd4
2.exd4 Bxd5
3.dxc5 and white gain a piece
1. Qg3 forces g6 then 2. B:c6 B:c6 3. Qe5 wins a piece
Well, my first thought was 1.Bg7, but I can’t really find a winning combination after black takes the bishop with the king. White probably has enough counterplay to hold, but I can’t find a win in that line.
With that out of the way, the next two moves interesting to me were 1.Ng5, tripling up on f7, and the simpler looking 1.Qg3 threatening Qg7#. The pin on f7 makes Qg3 look very promising since it prevents black from pushing f6. This is actually pretty common motif, and black’s replies are limited in this example:
1. Qg3 g6 (alternatives later)
2. Bc6 Bc6 (Qc6 3.Qe5 still)
3. Qe5 f6 (mate otherwise)
4. Qe7 wins a piece.
At move 1, black can block the dark square bishop at d4 with the knight, but this won’t help:
1. Qg3 Nd4
2. Nd4 and now, if black retakes- then white just captures the pawn with the bishop with the exact same threat. He will still have to lose the bishop at e7.