Exposing the major pieces to a fork. 8.Nd2!? , intending Rfd1 and Nf1, seems preferable.
White resigned in view of 13.Bxd5 Bxd5 with the double threat of 14...Rxe3 and 14...Rg6+.
Black sacrifices a pawn, aware that after 2...fxg3+ 3.Rxg3 he couldn't save it anyway; e.g. 3...Rh6 4.Bc4! Re8 5.Rcg1 Nf8 6.Nc5 with the inevitable threat of 7 Nxe6+.
A strong breakthrough that creates a passed pawn, as well as a protected square for the knight on d4.