====== Chess - Programming - Polyglot Book Format - Learn ======

**learn** is unused, and usually set to zero.

<WRAP info>
**NOTE:**  This field can be used to record learning information, or for extra information.

  * From Polyglot 2.0 on, Polyglot can also use this learn information for modulating the playing probabilities of the book moves, based on how often they were played and with how much success they met.

</WRAP>