TIPS is a book by Vaderlind, Guy & Larson, published by the MAA earlier this year. I'm fairly sure that the black & white squares problem was one that Loren Larson was investigating, so I'm copying this to him. R. On Tue, 19 Nov 2002 asimovd@aol.com wrote:
I thank Richard Guy for his answer (negative) to the converse domino question I posed.
Can someone please tell me where to find the "Inquisiive Problem Solver" ? I don't even know whether it's a magazine or website or what.
Somehow I don't think I associate Sol LeWitt's name with the problem I'm trying to recall. It was posted by someone whose name I don't think I recognized then and don't recall now. (If you are that person, please forgive me.)
But it had to do with 4x4 arrangements of black & white squares such that each row and each column contains 2 W and 2 B squares. The question was whether all such arrangements could be obtained in a certain way, which I don't remember, either.
--Dan