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--- chess:programming:polyglot_book_format:piece [2022/01/10 14:50] – peter
+++ chess:programming:polyglot_book_format:piece [2022/01/11 13:55] (current) – peter
@@ Line 1: / Line 1: @@
 ====== Chess - Programming - Polyglot Book Format - Piece ======
-See [[Chess:Programming:Polyglot Book Format:Position|Position]]
+**Piece** is part of the [[Chess:Programming:Polyglot Book Format:Key|Key]].
-**Piece** is the exclusive or of entries from RandomPiece, one for each piece on the board.
+It is the exclusive or of entries from the **RANDOM_PIECE** sub-array, one for each piece on the board.
-The offset of the entry in RandomPiece corresponding to a piece is computed as follows.
+The offset of the entry in **RANDOM_PIECE** corresponding to a piece is computed as follows: <code>
+piece = 64 * Piece_Type + 8 * Rank + File;
-<code>
-offset_piece=64*kind_of_piece+8*row+file;
 </code>
-"row" and "file" are counted from 0 to 7. With this convention one has
+----
-^Square^File^Rank^
+**Piece_Type** is encoded as:
-|a1|0|0|
-|h1|7|0|
-|a8|0|7|
-|h8|7|7|
-"kind_of_piece" is encoded as follows
-|black pawn    0
-|white pawn    1
-|black knight  2
-|white knight  3
-|black bishop  4
-|white bishop  5
-|black rook    6
-|white rook    7
-|black queen   8
-|white queen   9
-|black king   10
-|white king   11
 <code cpp>
@@ Line 51: / Line 29: @@
 </code>
+----
+**Rank** and **File** are counted from 0 to 7:
+^Square^File^Rank^
+|a1|0|0|
+|h1|7|0|
+|a8|0|7|
+|h8|7|7|
+----
 [[Chess:Programming:Polyglot Book Format:Piece|Piece]]