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Old 2014-01-05, 23:09   #6
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"Richard B. Woods"
Aug 2002
Wisconsin USA

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Suppose Black castles before pushing the f-pawn:

[b]17 ... O-O[/b]

Now, [b]18 Ng5[/b] no longer threatens to win the f-pawn by force, but it [i]does[/i] inhibit 18 ... f6 because of Nxe6. If Black kicks the N with ... h6 (not really a good idea), the knight calmly proceeds to its "real" destination with Ne4, ready to post on c5 (eying both the d7 rook-fork and Nxb7 to remove the N/c6 defender in case the N/e7 has moved), d6 or f6.
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