Since Ruud is posting "pearls" on the nightmare page this week, it seems like a good time to introduce another "pearl" from my friend Andrei's collection.
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*-----------*
|...|.1.|78.|
|5..|..9|...|
|...|...|.4.|
|---+---+---|
|.26|...|...|
|...|6..|..3|
|.74|.8.|...|
|---+---+---|
|...|..3|..2|
|.8.|.4.|.1.|
|6..|5..|...|
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