Calgary challenge

[Matt Mahoney]

It escaped my attention that Alexander Ratushnyak compressed the
Calgary corpus to a new record of 589,862 bytes (including the
decompressor size) last May. http://mailcom.com/challenge/

I looked at the decompressor. It is based on PAQAR with a tiny
dictionary like the previous submission last December. But it appears
there are two main differences. First, it uses bitwise contexts to
model pic (in PicModel), as in PAQ7. Second, it adds an indirect
context model (included in SparssModel), as in PAQ8F.

-- Matt Mahoney

[Phil Carmody]

Thanks for reporting that result, Matt.
Massive kudos to Alexander for the result.

Phil
--
The man who is always worrying about whether or not his soul would be
damned generally has a soul that isn't worth a damn.
-- Oliver Wendell Holmes, Sr. (1809-1894), American physician and writer