TheCodeBreakers
The two
extra spaces were used for a period and a letter-number shift sign:
0987654321
mdel v a y 6 bcf ghuj knp qrstuwxz. /
With this, e = 8, a = 5, b = 10, t = 27, and so on. There will be no
single 2 or 1. The decipherer takes all 1's and 2's as the first digits of a
two-digit group, and joins to it whatever digit follows. He takes any digits
from 3 to 0 as individuals if they are not already part of a pair. Thus the
ciphertext 828115125 can be unambiguously divided as828115125 and
deciphered to Espana.
Other configurations are possible. Seven single digits will permit three
side coordinates, for a total of 37 cells in the checkerboard. Six
singletons will produce 46 cells; five, 55, and so on down to one
singleton, 91 cells. The arrangement with 28 equivalents has been widely
used for Latin-alphabet texts, that with 37 for Cyrillic texts.
Although the M DEL VAYO checkboard was used by the Swedish
fellow traveler Dr
annaabi.ee 
