10
[more from this month]
Here's a puzzle based on Erich Friedman's "Distance," from the 2003 Google U.S. Puzzle Championship. Label 14 of the circles above with different numbers from 1 to 14, such that the distance between 1 and 2 is less than the distance between 2 and 3, and so on. Four circles should remain empty.
Note that this image is not part of the solution but just an example.

See comments for solution.
dave :
[10:43 on 10 June, 2006]