I recently got an e-mail from Michael Sherman, a teacher in New York. He had developed a variation of the card game Set called Complementary Pairs. This is how he described it:
“We have Set competitions at the school where I teach, both as individual time trials and as head-to-head matches. When many students at my school became capable of finding sets very quickly, I developed what I called C.P. Set (Complementary Pairs) to slow them down a bit and reduce the number of simultaneous calls in the head-to-head matches. The idea is to find two pairs of cards that both require the same 3rd card to complete a Set. The completing card does not need to be on the board; only the four cards forming the complementary pairs are picked up.” Continue reading
Henrik Warne's blog 