Welcome to our monthly puzzles

You are cordially invited to match wits with some of the best minds in IBM Research.

Seems some of us can't see a problem without wanting to take a crack at solving it. Does that sound like you? Good. Forge ahead and ponder this month's problem. We'll post a new one every month, and allow a month for you to submit solutions (we may even publish submitted answers, especially if they're correct). We usually won't reply individually to submitted solutions but every few days we will update a list of people who answered correctly. At the beginning of the next month, we'll post the answer.

Here is the solution for our November 2018 problem

And now... here's our
December 2018 challenge!

So give your mind a break from its routine---you never know what other problems you may solve in the process!

The current puzzlemaster is Oded Margalit. He took over from James B. Shearer, who took over from the original puzzlemaster Don Coppersmith, in October 2005.

If you have any problems you think we might enjoy, please send them in. All replies should be sent to: ponder@il.ibm.com

Ponder This Top 11 SolversList Updated: 06/06/2018 @ 12:00 PM EST

Dan Dima Solved 128 challenges
Joseph DeVincentis Solved 116 challenges
Daniel Bitin Solved 111 challenges
Liubing Yu Solved 83 challenges
Clive Tong Solved 82 challenges
John G. Fletcher Solved 82 challenges
David Friedman Solved 77 challenges
David Greer Solved 72 challenges
Amos Guler Solved 70 challenges
Motty Porat Solved 68 challenges
Radu Alexandru Todor Solved 66 challenges