Matthew Parker's Decoder #2010-1

Does the decoder from the January 2010 issue have you stumped? Here it is again:

How It Works 

The first digit in a number indicates which row to use on the left. The second digit tells you which column to use on the top. Write down the letter where the two numbers intersect. Example: The number 32 would be the intersection of row 3 and column 2. In this case they cross at the letter "M."

Oh, and number 24 can be either I or J. You have to figure that one out when you decipher the code.

This decoder was actually created about 200 years before Jesus' birth by a Greek historian named Polybius. It's called the Polybius checkerboard.

Look for another secret mesage next month!

Copyright © 2010 by Christopher Maselli. Used by permission. Illustration © Gary Locke.