Note: Due to servers upgrades, the IBM Research's Ponder This site update will take place in early September.

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 July 2019 problem

And now... here's our
August 2019 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 30 SolversList Updated: 11/06/2019 @ 12:00 PM EST

Dan Dima Solved 133 challenges
Daniel Bitin Solved 126 challenges
Joseph DeVincentis Solved 124 challenges
Clive Tong Solved 90 challenges
Liubing Yu Solved 84 challenges
David Greer Solved 83 challenges
John G. Fletcher Solved 82 challenges
David Friedman Solved 80 challenges
Radu-Alexandru Todor Solved 77 challenges
Motty Porat Solved 76 challenges
Harald Bögeholz solved 76 challenges
Amos Guler solved 75 challenges
Andreas Stiller Solved 72 challenges
Armin Krauss Solved 69 challenges
Todd Will Solved 66 challenges
Nyles Heise Solved 65 challenges
James Dow Allen Solved 64 challenges
Albert Stadler Solved 64 challenges
Mathias Schenker Solved 62 challenges
John TrompSolved 62 challenges
Chuck CarrollSolved 62 challenges
Chris Shannon solved 61 challenges
Peter GerritsonSolved 61 challenges
Florian Fischer solved 58 challenges
Shirish Chinchalkar solved 57 challenges
Michael Brand solved 56 challenges
Reiner Martin solved 56 challenges
Stéphane Higueret solved 55 challenges
Tamir Ganor solved 55 challenges
Kang Jin Cho solved 52 challenges

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