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--- chess:programming:polyglot_book_format:file_format [2022/01/11 13:29] – created peter
+++ chess:programming:polyglot_book_format:file_format [2022/01/11 14:14] (current) – peter
@@ Line 1: / Line 1: @@
 ====== Chess - Programming - Polyglot Book Format - File Format ======
+Polyglot files are usually named with a **.bin** extension.
+The files contain one or more entries with each entry having the following information:
+<code cpp>
+struct entry_t {
+   uint64_t key;
+   uint16_t move;
+   uint16_t weight;
+   uint32_t learn;
+};
+</code>
+<WRAP info>
+**NOTE:**   All integers are stored highest byte first (regardless of size).
+  * The entries are ordered according to key; Lowest key first.
+Sometimes the file format is shown as:
+<code cpp>
+struct entry_t {
+   uint64_t key;
+   uint16_t move;
+   uint16_t count;
+   uint16_t n;
+   uint16_t sum;
+};
+</code>
+  * This still represents the same data.
+</WRAP>