White to move. What is the plan?
Yancey Ward 1. Re3+ (cutting Black King off) Kd7, 2. Re4! (ready for the Lucena Bridge) Rf2, 3. Kh7 Rh2+, 4. Kg6 Rg2+, 5. Kf6 Rf3+, 6. Kg5! Rg2+, 7. Rg4 and White wins
It is important to note that the hard work is done at this point- white wins with every single move except the trivial Rh3 (draws) and Rf1 (loses). Equally efficient here would be 1.Rf4 followed by 2.Re4+.
7.Rg5 White stops the rook