On the threshold of one of the doors of Smithills Hall there is a bloody footstep impressed into the door-step, and ruddy as if the bloody foot had just trodden there; and it is averred that, on a certain night of the year, and at a certai... Read more of The Bloody Footstep at Scary Stories.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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