"Professor Smullyan was a serious mathematician, with the publications and the doctorate to prove it. But his greatest legacy may be the devilishly clever logic puzzles that he devised, presenting them in numerous books or just in casual conversation."
One of my friend drew my attention to this article on NY Times.
Place three piles of matches (coins, or something small, that you can group together easily) on the table. Make one pile with 11 matches, the second one with 7 matches, and the third one with 6 matches.
You are to move matches so that each pile contains 8 matches.
You can add to any pile only as many matches as it already contains, and all the matches must come from one other pile.
For example: If a pile contains 3 matches, you c...