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Jb wrote:

The following is a practice puzzle for 2-String Kite and Skyscraper. The other techniques that are required are SSTS minus the coloring techniques. It is generated by Simple Sudoku.

000400100000705032032000700001080605070000020503010800008000560650803000007001000

Beware! This practice has a nonunique solution

*-----------*
|...|4..|1..|
|...|7.5|.32|
|.32|...|7..|
|---+---+---|
|..1|.8.|6.5|
|.7.|...|.2.|
|5.3|.1.|8..|
|---+---+---|
|..8|...|56.|
|65.|8.3|...|
|..7|..1|...|
*-----------*

*-----------*
|765|432|198|
|189|765|432|
|432|198|756|
|---+---+---|
|921|387|645|
|876|549|321|
|543|216|879|
|---+---+---|
|218|974|563|
|654|823|917|
|397|651|284|
*-----------*

r2c3=49 r3c7=49 r8c3=49 r8c7=49

(end quote)

• You probably meant r2c7 instead of r3c7.
• A Unique Rectangle must occupy 2 boxes to cause 2 solutions. This rectangle occupies 4 boxes.
• This puzzle has a single solution (verified)

Ruud 00:26, 31 August 2007 (CEST)