Solution:
1. c7 Rd6+ 2. Kb5 White must keep the rook from c6,
and cannot go to c5 because of 1. .., Rd1 and draw.
2. ....., Rd5+ 3. Kb4 Rd4+ 4. Kb3 Rd3+ 5. Kc2! Rd4!
When white plays 6. c8=Q Rc4+!! 7. Qxc4 it's stalemate!
But:
6.c8=R!!! Ra4 (only move) 7. Kb3!!!
White wins the rook, or mates on c1!
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