Happy St. Patrick's Day!
I really liked this puzzle, Ruud. With 42 cells filled in I found a nice "6-star constellation" that allowed me to set the value in r7c9. That wasn't quite enough to crack it, though ... after completing 16 more cells I had to find an XY-Wing to wrap the whole thing up. dcb
17 March, 2006
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Another way
David,
Seeing your message, I had to try it. I got to this point with basic methods:
Now, there are three XY-wings! If you spot the wing on <7>, it will reveal a swordfish!
Not all of these are needed to solve the puzzle.
Keith
Keith
Seeing your message, I had to try it. I got to this point with basic methods:
Code: Select all
+----------------+----------------+----------------+
| 6 39 2 | 5 4 19 | 7 38 18 |
| 7 39 8 | 2 6 19 | 13 4 5 |
| 1 4 5 | 78 78 3 | 6 9 2 |
+----------------+----------------+----------------+
| 5 78 3 | 4 789 2 | 89 1 6 |
| 9 178 167 | 678 3578 5678 | 238 2378 4 |
| 4 2 67 | 1 3789 678 | 5 378 789 |
+----------------+----------------+----------------+
| 8 6 14 | 3 2 57 | 149 57 19 |
| 3 5 47 | 9 1 678 | 248 2678 78 |
| 2 17 9 | 678 578 4 | 18 5678 3 |
+----------------+----------------+----------------+
Not all of these are needed to solve the puzzle.
Keith
Keith
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- Joined: Fri Jan 20, 2006 6:21 pm
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I'm not good at XY-Wings
Yup, that's the spot I was at when I found the "constellation." I didn't notice the XY-Wings at this stage ... I concentrated on r2c7, and saw that whichever value is placed there, r7c9 is still the same. dcb