Fix column iteration.

src/pegp/solver.d

@@ -51,7 +51,7 @@ class Solver
         bool found_valid_move = false;
         for (int row = 0; row < m_size; row++)
         {
-            for (int col = 0; col < row; col++)
+            for (int col = 0; col <= row; col++)
             {
                 for (Board.Direction direction = Board.Direction.FIRST;
                      direction < Board.Direction.COUNT;