winning condition, namely when the royal piece reaches (and survives in)\r
one of the four central squares.\r
\r
+NOTE: Any piece value that (in decimal notation) ends in '3' will not be \r
+accepted as promotion choice. (And neither will be absolute royalty,\r
+i.e. piece value -1).\r
+\r
The individual bits in the move-mode descriptor have the following meaning:\r
In the last hexadecimal digit:\r
1 capture allowed (of enemy piece; own pieces always block a move)\r