Student Opening Book (bin)

 

Depth 100

Best Book Move: OFF

Book - BIN format ( Used by chess GUIs Arena 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. For example, PolyGlot uses 16 bytes for each item, including hash, move, weight, learning values. Items of a book should be sorted by their hash. 

So when a chess program has to decide on a move, it will look up (by using binary-search) using the hash value of the current position to collect all information come with that hash value and then make a decision upon it.

To build and/or edit those opening books, users need to use special software. (source)

Student Opening Book (bin) download

These and other books are also available on the "download" page of our blog. Check HERE