Solution to Lasker's Rook Ending Problem
To solve Lasker's rook ending problem, one must remember the basic principles of pawn promotion and keep an eye out for the old chess parachute, the forced stalemate.
Solution
1. c7 Rd6
2. Kb5 Rd5
3. Kb4 Rd4
4. Kb3 Rd3
5. Kc2 Rd4!
6. c8R!! (6. c8Q Rc4 !! And stalemate.)
6. ... Ra4
7. Kb3! and white wins.

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