commit 17f83ef69de49fcc9a5c731eace69ad9bc979f17
Author: Parin Porecha <parinporecha@gmail.com>
Date:   Tue Nov 12 17:20:52 2013 -0900

    Corrected a bug in an earlier patch of mine to thicken 3x3 border.
    
    Now, block borders will get thickened for 2x3, 2x4 and similar sudokus also.

diff --git a/src/sudoku-view.vala b/src/sudoku-view.vala
index d489c3b..e549602 100644
--- a/src/sudoku-view.vala
+++ b/src/sudoku-view.vala
@@ -667,11 +667,11 @@ public class SudokuView : Gtk.AspectFrame
                 cells[row, col] = cell;
                 cell.show ();
 
-                if (col != 0 && (col % game.board.block_rows) == 0)
+                if (col != 0 && (col % game.board.block_cols) == 0)
                 {
                     cell.set_margin_left ((int) grid.border_width);
                 }
-                if (row != 0 && (row % game.board.block_cols) == 0)
+                if (row != 0 && (row % game.board.block_rows) == 0)
                 {
                     cell.set_margin_top ((int) grid.border_width);
                 }
