How can White win? White can sacrifice the rook 6 times in this fascinating study from Troicki 1910. If the Queen accepts the rook sacrifice, then Knight forks will follow! Solution:

1.Rb4-Qc8

2. Rb8-Qh3

3. Rh8-Nh4

4. R:h4-Qc8

5.Rh8-Qb7

6.Rb8-Qb8

7.Nc6+