Wolfram Language Paclet Repository
Community-contributed installable additions to the Wolfram Language
FredSimons`SudokuHints`
XYChain |
|
| | ||||
Details and Options
Examples
(2)
Basic Examples
(2)
In[1]:=
 | XYChain |
Out[1]=
Contents cannot be rendered at this time; please try again later or download this notebook for full functionality » |
XYChain-8: R3C1(6) |
The three yellow colored cells form an XY-chain (or, because of the length is 3, an Y-wing) for the candidate 8. Start with the dark yellow cell R2C1. When it is not 8, it is 7, hence R2C9 is 9 and R3C7 is 8. Therefore, the candidate 8 has to be placed in at least one of the yellow cells R2C1 and R3C7 and therefore can be removed form the green cell R3C1, that sees both endpoints of the chain..
In[1]:=
| XYChain |
Out[1]=
Contents cannot be rendered at this time; please try again later or download this notebook for full functionality » |
XYChain-5: R5C4(2,6), R9C6(3,8) |
This is a longer XY-chain, for the candidate 5. Start in the dark yellow endpoint R4C6. If we do not have a 5 there, it is a 3, which implies R4C1=6, R4C8=4, R9C8=8, R7C9=4 and therefore in the other endpoint R7C4 we must have a 5. Therefore, the candidate 5 can be removed from the two cells R5C4 and R9C6, that see both endpoints.
 |
|
 |
|
 |
|
""