18.Ndb5!! axb5 19.Nxb5 Qb6 20.Nd6+ Ke7 (20...Qxd6!? but it must be lost. Now we have momentary material equality, as the black queen and knight briefly struggle to protect their stranded monarch from the entire white army) 21.fxe5 Nd7 22.exf6+ Nxf6 23.Qg3 Kf8