diff --git a/sudoku.py b/sudoku.py
index 4354bf2..d07c787 100644
--- a/sudoku.py
+++ b/sudoku.py
@@ -15,6 +15,21 @@ class Sudoku:
         self.size = size
         self.board = bytearray(b'\x00' * (size * size))
 
+    @property
+    def solved(self):
+        def _check_group(group):
+            values = sorted([self.board[i] for i in group])
+            is_complete = values == list(range(1, self.size+1))
+            return is_complete
+        
+        sz = self.size
+        sz2 = sz ** 2
+        dim = int(math.sqrt(self.size))
+
+        rows = [range(i * sz, i * sz + sz) for i in range(sz)]
+        cols = [range(i, sz2, sz) for i in range(sz)]
+        # TODO: WIP
+
     def __str__(self):
         field_width = len(str(self.size))
         dim = int(math.sqrt(self.size))
@@ -33,5 +48,6 @@ class Sudoku:
             lines.append('|' + '|'.join(chunks) + '|')
         lines.append(spacer)
         fmt = '\n'.join(lines)
-        out = fmt.format(board=[str(n) if n != 0 else ' ' for n in self.board])
+        str_board = [str(n) if n != 0 else ' ' for n in self.board]
+        out = fmt.format(board=str_board)
         return out