Compression for chess game data... what to use?

[Mike Davies]

That looks like the reverse engineering of the "new" Chessbase format (CBH and it's plethora of files). I was thinking of the original Chessbase format (just the CBF + CBI files).

Ah here's the document I was thinking of:
https://hwiegman.home.xs4all.nl/filefor ... HSBASE.TXT (Section 2.4: Halfmoves and variants)

Sorry it took me some time to track this down again, been a long long time since I last read this.

[Nomad]

That is very useful. Thanks. One interesting feature that probably needs to be patched

Its in the game header.

Code: Select all

  		0     sbyte   GY (signed byte)
                year of game = GY+1900.
                (e.g. -29 = $E3 => 1871)
                if GY = 127 then no year specified

2027 = no year specified

That disassembly is very well done.

[Mike Davies]

Found this article talking about various chess move compression while trawling on a different project:

https://triplehappy.wordpress.com/2015/ ... mpression/

[Nomad]

Thank you, that post is very interesting.