1 … bxa4 2 bxa4 Black would be worse following 3 Nd2. If Black contests c4 with … Nb6 the knight is driven back by a4-a5!. Also bad is 1 … b4? 2 Nb1! Nb6 3 Nbd2 Re7 4 a5! Na8 5 Nc4!.
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Hou Yifan – Kosteniuk Nalchik 2008 Black to play White is preparing the Ng3-f5. What can Black do?
This is a good time for 1 … h5!. White would be over-extended after 2 g5 Nh7 3 h4 g6 and … f6.
2 N3h2, to maintain the pawn on g4. This surrendered control of the kingside dark squares. The best try is 2 gxh5! Bxh3 3 N1h2 but Black is better after 3 … Nh7.
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Tal – Plaskett Sochi 1984 Black to play Black is virtually forced into 1…fxg3. Is there any benefit to 2.fxg3?
Yes, because of playing along the f-file in connection with Nd5.