The LesChats opening book series is produced by Jordi Ruiz Centelles.
Book - BIN format ( Used by chess GUIs Arena, Banksia and Droidfish)
Binary books have some important advantages, especially for computer chess engines: space-efficient, fast on accessing and searching, more useful information.
At the most simple form, they are just a conversion of above text-opening books into binary, in the ready form for software and save text-binary converting steps. However, the major number of top books is built and worked with hash values from transpositions. Often each position is stored as a hash value (8 bytes) and some extra information such as the number of times occurred, number of games won by white/black / drawn with this position, average/maximum Elo of players playing to this opening position, chess program's success with the position. To save space those extra information typically about 2-8 bytes.
LesChats 110824 book (.bin) - download
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