King from 871-901 A.D. The Danes were neighbors of the Norwegian Vikings, and like them were fond of the sea and piracy. They plundered the English coasts for more than a century; and most of northern and eastern England became for a ... Read more of Alfred the Great at Biographical.caInformational Site Network Informational
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THE EXCHANGE PUZZLE.

(Moving Counter Problem)
Here is a rather entertaining little puzzle with moving counters. You
only need twelve counters--six of one colour, marked A, C, E, G, I, and
K, and the other six marked B, D, F, H, J, and L. You first place them
on the diagram, as shown in the illustration, and the puzzle is to get
them into regular alphabetical order, as follows:--
A B C D
E F G H
I J K L
The moves are made by exchanges of opposite colours standing on the same
line. Thus, G and J may exchange places, or F and A, but you cannot
exchange G and C, or F and D, because in one case they are both white
and in the other case both black. Can you bring about the required
arrangement in seventeen exchanges?
It cannot be done in fewer moves. The puzzle is really much easier than
it looks, if properly attacked.


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