1...Bxg3+!
2.hxg3Qxg3+
3.Kd1Rad8+
4.Bd2Nd4
A queen move is refuted by Nxf3, so White tries an exchange of queens
5.Nf1Nxc2
6.Nxg3Nxa1
7.e5
Despair. If instead 7.b3 Bxb3+ 8.axb3 Nxb3 9.Nf1 Rxd2+ 10.Nxd2 Rd8 etc.
7...Bxa2
8.f4Nb3
9.Ne4Rxd2+
And White resigned
Santasiere-Marshall, New York (1941)