Post #14555 126 Aug 5, 2026, 20:04 UTC ColourfieldsИсточник: Arthur O’Dwyer Arthur O’Dwyer Colourfields Over on the (inexplicably login-walled) site “NewEnigma,” Keith Austin writes: Draw a 4-by-4 grid. Colour each square red or blue. Select any square, S, and write 1 in it. Then write 1 in every square you can reach from S by a series of moves, where each…