minor fixes

board.txt

@@ -0,0 +1,18 @@
+ 123   456   789
+     |     |
+ ... | ... | ...  a
+ ... | ... | ...  b
+ ... | ... | ...  c
+     |     |
+ ----------------
+     |     |
+ ... | ... | ...  d
+ ... | ... | ...  e
+ ... | ... | ...  f
+     |     |
+ ----------------
+     |     |
+ ... | ... | ...  g
+ ... | ... | ...  h
+ ... | ... | ...  i
+     |     |

board2.py

@@ -75,7 +75,8 @@ class Board:
                     for k in range(3):
                         for l in range(3):
                             buf.append(TwoDPos(TwoDPos.l, (i, j, k, l)))
-    
+        return buf
+
     def possible(self):
         try:
             move = self.moves[-1]
@@ -90,7 +91,7 @@ class Board:
             return buf
 
         local = move.local()
-        if self.subWin(local[0], local[1]):
+        if self.subWin(local[2], local[3]):
             return self.reachableEmpty()
 
         buf = []