This was the idea: Black just ignored White's threat to win the exchange - not the mate threat, of course . . . Thus Black repulses White's attack; he has one pawn for the exchange as well as pressure against the e4-pawn and along the c-file.

A fine central queen! Black clearly has sufficient play for the exchange and a draw was agreed on move 32 .

Here it seems that Black does not have to fear the standard sacrifice on g5 .

Most likely White had taken this move into account, but missed something further on.

15.Qh5 hxg5 16.Bxg5 Nf6 17.Qh4 Re6.

White has insufficient compensation.

Very imaginative! Black has not castled, yet the capture of this pawn will speed up an initiative on the kingside.

Too slow. 20...h5!? 21.g6 f5.