On: The $5000 Compression Challenge

[raverbashing]

In this case your dictionary either doesn't have everything or to adequately point to it you take as much space as not using it.

While Pi has all pairs of 2 digits, your index would take more space than storing the pairs itself (because you might need to go beyond position 99)

For one situation you might "get lucky" and find a coincidence, but this won't scale generically

[gbl08ma → raverbashing]

See also: https://github.com/philipl/pifs and https://github.com/philipl/pifs/issues/23

I admit this fooled me for a bit. Good news is, I won't be fooled again by something similar :)