

miistermagico Regular user 156 Posts 
Dear Mystery Entertainers,
In Martin Gardner's autobiography he mentions a strange type of magic square that forces someone to choose a number even though the choice seems random. Is anyone familiar with this strange magic square and where it is explained in detail? I am very interested in this curious mystery. Please reply soon. Sincerely, miistermagico 
everitt99 New user 23 Posts 
This is probably the principle that is discussed in Karl Fulves' "Hex Squared". They resemble magic squares but have a different property built within them. There was a thread not too long ago on this forum which discussed this principle

miistermagico Regular user 156 Posts 
Dear Mystery Entertainers,
I have a suspicion this is the answer I am looking for: There is a long history in magic of using the standard magic square to force the number 15, See: Martin Gardner's Mathematics, Magic and Mystery Do you have other suggestions I am unaware of? Sincerely, miistermagico 
ddyment Inner circle Gibsons, BC, Canada 2045 Posts 
I have written an essay on the forcing matrix that might be of interest.
Doug Dyment's Deceptionary :: Elegant, Literate, Contemporary Mentalism ... and More

saxonia New user 54 Posts 
Hello,
In addition to Doug's great article, here are a few sources to read if you are interested in this principle: * Gardner, Martin: Hexaflexagons and Other Mathematical Diversions, The University of Chicago Press, 1988, p. 15ff  ''Magic with a Matrix'' * Gardner, Martin: The Magic Numbers of Dr. Matrix, Prometheus Books, Buffalo & New York, 1985, p. 146ff  ''Clairvoyance Test'' * Gibson, Walter: Date Sense, The Jinx, No. 41, Febr. 1938, p. 279 * Henry, Thomas: Hidden Numerical Forces, Leaping Lizards Publishing, 2006, p. 85ff  ''The Matrix Force'' * Goldstein, Phil: The Violet Book of Mentalism, 1980, p. 8f  ''Rainbow Matrix'' * Goldstein, Phil: Rethink, in: SpellBinder, vol. 2, no 24, p. 468f * Kraitchik, Maurice: Mathematical Recreations, W.W. Norton & Company, New York, 1942, p. 184ff * Stover, Mel: The Irrisistible Force, in: The New Phoenix, No.340, January 1957, p. 171f * Waters, T. A.: Mind Myth and Magic, Hermetic Press, Seattle, 1993, p. 222ff  ''Insight Straight'', p. 279ff  ''Quintasense'' and p. 557ff  ''Threesum'' 
Scott Cram Inner circle 2666 Posts 
As always, be careful about publicly available information about mathbased routines. For example, here’s a blog post and video about this routine: https://mindyourdecisions.com/blog/2015/......puzzle/
Interestingly, the above post only discusses proof of the 34 square, and doesn’t delve into how to make other squares with different totals. It only proves how this one square works. So, if you use a different square, you may be able to get away with it. Saxonia recommends several works, but I would most highly recommend the Violet Book of Mentalism reference, as Phil Goldstein does a wonderful job of explaining some highly effective psychological and presentational aspects of this routine that will make it more effective. 
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