diff -r 0e591f806290 -r 8a34b2ebc8cc progs/sudoku.scala
--- a/progs/sudoku.scala	Tue Dec 03 11:07:09 2019 +0000
+++ b/progs/sudoku.scala	Mon Jan 27 10:18:13 2020 +0000
@@ -64,6 +64,10 @@
   }
 }
 
+def pretty(game: String): String = 
+  "\n" + (game.sliding(maxValue, maxValue).mkString(",\n"))
+
+
 // a list of hard games according to Andrew Coles and Peter Norvig
 
 val hard_games = 
@@ -180,6 +184,9 @@
        "....14....3....2...7..........9...3.6.1.............8.2.....1.4....5.6.....7.8...",
        "4.....8.5.3..........7......2.....6.....8.4......1.......6.3.7.5..2.....1.4......")
 
+println("108:\n" ++ pretty(hard_games(108).replaceAll("\\.", " ")) ++ "\n")
+println("109:\n" ++ pretty(hard_games(109).replaceAll("\\.", " ")) ++ "\n")
+
 
 // for measuring time
 def time_needed[T](i: Int, code: => T) = {