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.
So give your mind a break from its routine---you never know what other problems you may solve in the process!
Hosted by
IBM Research - Haifa
The current puzzlemaster of Ponder This is Gadi Aleksandrowicz. Previous puzzlemasters include Oded Margalit (2007-2020), James Shearer (2005-2009), and Don Coppersmith (1998-2005).
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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 52 SolversList Updated: May 24th 2020
Solver | Challenges solved |
---|---|
Daniel Bitin | 138 |
Dan Dima | 134 |
Joseph DeVincentis | 113 |
Clive Tong | 96 |
David Greer | 95 |
Radu-Alexandru Todor | 88 |
David Friedman | 88 |
Liubing Yu | 84 |
Motty Porat | 81 |
Harald Bögeholz | 79 |
Andreas Stiller | 78 |
Todd Will | 77 |
Nyles Heise | 73 |
Florian Fischer | 69 |
Albert Stadler | 69 |
James Dow Allen | 69 |
John Tromp | 68 |
Peter Gerritson | 65 |
Chris Shannon | 65 |
Tamir Ganor | 63 |
Chuck Carroll | 63 |
Amos Guler | 63 |
Mathias Schenker | 61 |
Kang Jin Cho | 58 |
Lorenz Reichel | 58 |
Armin Krauss | 58 |
Solver | Challenges solved |
---|---|
Reiner Martin | 58 |
Shirish Chinchalkar | 57 |
Daniel Chong Jyh Tar | 56 |
Michael Brand | 56 |
Shouky Dan | 55 |
John G. Fletcher | 53 |
Stéphane Higueret | 52 |
Alex Fleischer | 51 |
Luke Pebody | 51 |
Dieter Beckerle | 48 |
John T. Robinson | 48 |
Graham Hemsley | 47 |
Arthur Breitman | 47 |
Adam Daire | 45 |
Bert Dobbelaere | 44 |
Gale Greenlee | 44 |
Victor Chang | 44 |
Christian Blatter | 43 |
Alan Murray | 43 |
Francis Golding | 43 |
Jan Fricke | 42 |
Phil Muhm | 42 |
Oleg Vlasii | 41 |
Hugo Pfoertner | 40 |
Arthur Vause | 40 |
Aviv Nisgav | 40 |