1.Nb2!
This quiet move carries the threat of 2.Rh4 with unavoidable mate
1...Re4!
The best defence. 1... b5 does not help, as 2.Rh4 Nc6 3.Ra4+ bxa4 4.Nc4# demonstrates!
2.Be3!Nc6
Of course the bishop is untouchable because of the fork on c4
3.Bc5+Nb4
4.Nd3a5
5.Bxb4+!axb4
6.Rh8!
Threat Ra8#. If 6... b2 7.Ra8+ Kb3 8.Nc5+ and if 6... Ka5 7.Nc5+ immediately. There remains but one move:
6...Re6
7.Ra8+Ra6
8.Rxa6+!bxa6
9.Nb2!a5
10.Ka1a4
11.Nc4#
Gurvich (1929)