You could move Rg1, then Rg8 as well, instead of Rc1 -> Rc8.
Puzzle 26 (Sladek 1955)
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nUb9834 wrote:
You could move Rg1, then Rg8 as well, instead of Rc1 -> Rc8.
3 Rg1 is met by 3...c1N+ and it is not mate in four.That's the reason for Rc1.
hint: notice the stalemate.