Unknown player
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a
b
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Example
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1.
Bg5
...
If Black now plays d5 to defend the Knight...
1.
...
d5
1...
h6
Black can't defend on f6.
2.
Bxf6
gxf6
3.
Ng3
We weaken thesquares on the kingside and will use them to attack the King.
2.
cxd5
White wins a pawn.