Henry Ernest Dudeney/Puzzles and Curious Problems/249 - Odds and Evens

by : $249$

 * Odds and Evens
 * Place eight counters in a pile on the middle circle so that they shall be in proper numerical order, with $1$ on the top and $8$ on the bottom.


 * Dudeney-Puzzles-and-Curious-Problems-249.png


 * It is required to transfer $1$, $3$, $5$, $7$ to the circle marked "Odds", and $2$, $4$, $6$, $8$ to the circle marked "Evens".
 * You can only move one counter at a time from circle to circle, and you must never place a number on a smaller number,
 * nor an odd number and an even number together on the same circle.


 * What are the fewest possible moves?