Royal game of Ur: forbid taking pieces on stars

pyclient/games/ur.py

@@ -76,6 +76,10 @@ class RoyalGameOfUr(Game):
         for i in range(BOARD_LENGTH - self.roll):
             dest = i + self.roll
             
+            # Skip star fields if they're already occupied
+            if dest in STAR_FIELDS and dest not in SAFE_FIELDS and self.board[dest] != ( 0, 0 ):
+                continue
+
             if self.board[i][self.mover] > 0:
                 if dest in STACK_FIELDS or self.board[dest][self.mover] == 0:
                     yield i
@@ -89,12 +93,12 @@ class RoyalGameOfUr(Game):
 
         d : dict[str, Any] = dict(
             enemies_at_start=self.board[0][ot_index],
-            enemies_at_finish=self.board[15][ot_index],
+            enemies_at_finish=self.board[BOARD_LENGTH-1][ot_index],
             safe_fields=list(SAFE_FIELDS),
             stack_fields=list(STACK_FIELDS),
             star_fields=list(STAR_FIELDS),
             tokens_at_start=self.board[0][my_index],
-            tokens_at_finish=self.board[15][my_index],
+            tokens_at_finish=self.board[BOARD_LENGTH-1][my_index],
             valid_moves=list(self.__valid_moves()),
         )