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 Post subject: Help with XY-Chain
PostPosted: Tue Oct 27, 2015 9:40 pm 
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This is Grid 2 of the upper left section of a butterfly samurai puzzle by djape. I've completed all four of the other sections.

Code:
.-------------------------------.-------------------------------.-------------------------------.
| 46        157       57        | 149       8         149       | 2         67        3         |
| 46        17        9         | 3         14        2         | 5         67        8         |
| 2         3         8         | 67        67        5         | 9         1         4         |
:-------------------------------+-------------------------------+-------------------------------:
| 13        48        134       | 478       9         3478      | 6         2         5         |
| 359       459       2         | 46        456       34        | 1         8         7         |
| 7         58        6         | 2         15        18        | 3         4         9         |
:-------------------------------+-------------------------------+-------------------------------:
| 139       479       1347      | 1479      147       6         | 8         5         2         |
| 158       2         157       | 1578      3         178       | 4         9         6         |
| 589       6         45        | 4589      2         489       | 7         3         1         |
'-------------------------------.-------------------------------.-------------------------------'


Richard's SudokuSolver gives me the following hint:

Grid 02: XY-Chain r5c4(4/6) - r3c4(6/7) - r4c4=r4c6

I haven't used XY chains yet, so I don't really understand what that hint is trying to tell me. Can someone please explain?


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