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Credits:

Patrick Redford expanded the mathematical principle of Martin Gardner and Karl Fulves, and arrived at something brilliant to work with four objects. The principle originally appeared in 2004 as part of the project Ensconced Fundament. Patrick have a ton of work with this principle which include “Quartet”, ”Tetrad Squared" and “Four Top" etc. I first saw the routine “Coin Claw” from his wonderful book Heptagon+ and fell in love with the principle. I would like to thank Patrick for his consent to include Tetrad Force in this project. Full credits go to Patrick Redford, Martin Gardner, and Karl Fulves.