Unknown player
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a
b
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Example
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Black has a weak square on d5.
1.
Bg5
...
1.
Nd5
Nxd5
2.
cxd5
is bad as we arelosing the weak square.
1.
...
h6
2.
Bxf6
Bxf6
3.
Nd5
After exchanging thedefender, White gets a clear access to the central outpost.