Unknown player
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Pgn 8
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d4 is a weak square, but we can exchange pieces controlling it.
1.
Nb3
Nd4
1...
Ba7
2.
Be3
Bxe3
3.
Qxe3
2.
Nxd4
Bxd4
3.
Be3
Bxe3
4.
Qxe3
And the weakness of d4 square isn't important anymore as black doesn't have pieces to exploit it.