- Code: Select all
. wz . | . . . | . . .
-Z wxyz -Z | . xz . | . yz .
. . . | . . . | . . .
quote is from scanraid.com whom has better written explinatiosn on move sets then i can give:
This is an extension of XYZ-Wing that uses four cells instead of three. Each possible value of the hinge cell results in a Z value in one of the cells in the WXYZ-Wing pattern, thus leaving no room for a Z on any cell all four can 'see'.
Its name derives from the four numbers W, X, Y and Z that are required in the hinge. The outer cells in the formation will be Wz, XZ and YZ, Z being the common number
example: from scanraid.com
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.----------------.------------------.---------------.
| 1479 8 4579 | 13579 2 157 | 35 49 6 |
| 2 6 59@ | 4 39 8 | 35 1 7 |
| 147-9 3 4579@ | 6 79@ 157 | 8 49@ 2 |
:----------------+------------------+---------------:
| 5 2 1 | 79 6 47 | 49 3 8 |
| 69 7 69 | 8 14 3 | 2 5 14 |
| 3 4 8 | 25 19 25 | 6 7 19 |
:----------------+------------------+---------------:
| 47 5 2 | 137 8 9 | 147 6 34 |
| 8 19 347 | 137 347 6 | 1479 2 5 |
| 467 19 3467 | 1237 5 1247 | 1479 8 349 |
'----------------'------------------'---------------'
4578 in R2C3, R3C359 =>R3C1 <>9
notes: this is a move set that will never be used very often.