Quote:
Originally Posted by davieddy
If Martin Gardner posed it, it qualifies for this thread IMHO. What do you think of Nim?

I will note that Martin Gardner presented many mathematically related topics which were not "puzzles" in the sense of Henry Dudeney or Sam Loyd.
In particular, I recall that he popularized John Conway's cellular automaton "Game of Life", as well as many other interesting topics.
As for Nim, I worked out the winning strategy decades ago. As a result, I find it of little more interest than Tic Tac Toe.