An endgame study from 1921 by Leonid Kubbel.
White to move and draw.
Solution:
1.Nd4!!
With 1.Nd4!! the threat is both 2.Re6 and 2.Ra3+ Kb7 3.Rb3.
1.Re6 Qxe6 doesn't work for white since 2.Nc5+ is impossible to play.
1...Qxd4
Or 1...Qd8 2.Ra3+ Kb7 3.Rb3+ Kc8 (Not 3...Kc7?? 4.Ne6+ and 5.Nxd8 winning) 4.Rb8+! Kxb8 5.Nc6+ Kc7 6.Nxd8 Kxd8 and draw.
2.Ra3+ Kb5 3.Rb3+ Kc4 4.Rc3+ Kd5 5.Rd3! Qxd3 and draw since it is stalemate.
Wikipedia about Leonid Kubbel
