Implement Betza hr and hr as chiral move sets

To easily separate right- and left-handed moves on oblique atoms
(which needs opposite use of l and r in their multi-leg continuations),
the direction sets hr and hl are added.

diff --git a/moves.c b/moves.c
index 647aa44..aed8d7c 100644 (file)
--- a/moves.c
+++ b/moves.c
@@ -300,6 +300,9 @@ MovesFromString (Board board, int flags, int f, int r, int tx, int ty, int angle
                    break;
          case 'N': all = 0xFF;  // oblique atom (degenerate 8-fold)
                    if(tx >= 0) goto king;        // continuation legs specified in K/Q system!
+                   if(*desc == 'h') {            // chiral direction sets 'hr' and 'hl'
+                       dirSet = (desc[1] == 'r' ? 0x55 :  0xAA); desc += 2;
+                   } else
                    while(islower(*desc) && (i = dirType[*desc-'a']) != '0') {
                        int b = dirs2[*desc-'a']; // when alone, use narrow version
                        if(desc[1] == 'h') b = dirs1[*desc-'a'], desc += 2; // dirs1 is wide version