Another idea: deter Nf5
[b]17 g4[/b]
17 ... h6 But that also allows deterrence of Ng5.
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Back to:
[b]17 d4[/b]
[b]17 ... O-O[/b]
Speculation: 18 Ng5 Nf5 19 Ne4 Nce7 20 g4 Nh4 21 Bg5
or 20 ... Nxe3 21 Nxe3 h6
or 20 Nc5 Bxg2 21 Kxg2 Rfd8 22 Bg5
[b] 17 ... Nf5[/b]
18 Ng5 O-O transposes into preceding speculation.
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