Better is 1 Rfd1 because 1 … Nb6 allows 2 Nxb5! and 3 Bc7. And on 1 … Nf6, the 2 a4! with an edge.

1 … g5!. Black would have the edge if the offer is declined (2 Rad1 gxf4 3 Bxf4 Ne5).

2 fxg5 hxg5 3 Bxg5 Ne5

prepares … Nc4, … Nxf3+ or a capture on g4.

Better was 5 Bxe7 Qxe7 6 Bg2 Nf8 with mixed chances.

Black wins.

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!.

Now White should not allow 2 … b4 and 3 … c3.

Black has good compensation.

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.

Black’s initiative won after 7 … g6 followed by … Kg7/ … Rh8.