

miistermagico Regular user 155 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 29 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 155 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 2082 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 89 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 2676 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. 
art85y Elite user homean unremarkable spiral arm of an insignificant galaxy 439 Posts 
Quote:
On Oct 26, 2018, ddyment wrote: Doug, I transcribed and downloaded this years ago, I don't think I was a Café member back then, did not realise it was you, many, many thanks.
Use the FORCE Luke.

saxonia New user 89 Posts 
Hello,
by coincidence, a few days ago I found a variant of this in "A Novel Colour Force" by Arthur Carter in "Magigram" November 1976. It forces a colour after asking for a month of birth. After the month of birth is called, the board is used to count to this month (first cell for January, second one for February, etc.) For those who are interested in the topic, the article is worth reading. 
saxonia New user 89 Posts 
Sory, please forget my last posting. It wrongly refers to a different principle.

Thomas Henry Special user 757 Posts 
Hello Saxonia,
Don't be sorry; I'm glad you mentioned it, even if different, for I like to keep uptodate with attributions and sources. Would it happen to be similar to the following? https://www.themagiccafe.com/forums/view......forum=82 If so, then the principle predates Carter by some thirty or forty years and is due to Stanley Collins I think. Thomas Henry
Omne ignotum pro magnifico.

saxonia New user 89 Posts 
Dear Thomas,
You are right, I was referring to the colour counting frame for which you have posted really nice ideas in this other thread recently. Ralf 
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