1...Nxc3
2.Rxc3Rxc3
3.Rxc3
Now, if the White king is attacked by 3... Qb1+ 4.Qf1 Rd1 5.Rc8+ and Black perishes
3...Qb2!
But this solves the problem, diverting the White queen from its defence of the back rank, while also threatening the Rc3!
0-1
Bernstein-Capablanca (1914)