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--- chess:programming:polyglot_book_format:castle [2022/01/11 13:47] – created peter
+++ chess:programming:polyglot_book_format:castle [2022/01/11 13:54] (current) – peter
@@ Line 1: / Line 1: @@
 ====== Chess - Programming - Polyglot Book Format - Castle ======
+**Castle** is part of the [[Chess:Programming:Polyglot Book Format:Key|Key]]
+It is the exclusive or of entries from the **RANDOM_CASTLE** sub-array.
-----
-**castle** is the exclusive or of entries from the **RANDOM_CASTLE** sub-array.
 The offsets are computed as:
-|White can castle short|0|
+^Color^Castle Side^Offset^
-|white can castle long|1|
+|White|King-side Castle|0|
-|black can castle short|2|
+|White|Queen-side Castle|1|
-|black can castle long|3|
+|Black|King-side Castle|2|
+|Black|Queen-side Castle|3|
-If none of these flags apply then castle=0.
 <WRAP info>
 **NOTE:**  These flags are all true in the starting position and are only updated **after** the appropriate King, Rook or Castling moves.
+  * The default value for this field should be 0 if if none of these flags apply; i.e. then castle=0.
 </WRAP>
+<WRAP important>
+**WARNING:** Even though the flag may indicate that castleling can be done, a program should verify that a Castle-move is actually valid, as some mistakes may creep in.
+</WRAP>