Yesterday I started solving a jigsaw puzzle thar my brothers gave
  me a few months ago.  And I finished today :-)
  It's a 1000 pieces puzzle from Schim Schimmel, and it shows a very
  nice landscape, with a lake, two houses and some trees, all covered
  by snow.  It seemed to be very difficult because of the sky, the lake
  and the snow, but in fact there is a way to cheat: all the pieces of
  the puzzle are written on the back, showing some letters which tells
  the player which zone that piece belongs to (there are 24 zones with
  letters from 'A' to 'X').
  Appart from that, the pieces of puzzle are very thin and weak,
  and many of all them have exactly the same shape, so it is very
  difficult to know if you are placing them in the right spot.
  I don't recommend that brand to anyone willing to buy a new jigsaw
  puzzle.