I noticed that the finned x-wing pattern was symmetrical and wondered it the puzzle would yield the same discard if rotated.
I was surprised that I found that the puzzle gives a different discard if rotated...
This puzzle has a finned x-wing: cand=1; r=2,5; c=2,5; fin r2c1; r1c2<>1
- Code: Select all
129 128 37 | 4 5 6 | 17 38 2389
129 128 5 | 7 12 3 | 6 4 289
4 6 37 | 12 8 9 | 17 5 23
-----------+----------+------------
5 3 12 | 12 6 7 | 8 9 4
7 12 8 | 9 12 4 | 3 6 5
6 9 4 | 8 3 5 | 2 7 1
-----------+----------+------------
38 7 6 | 5 4 2 | 9 1 38
28 5 9 | 3 7 1 | 4 28 6
123 4 12 | 6 9 8 | 5 23 7
This puzzle is the previous one (rotated 90 degrees clockwise); and it has a finned x-wing, cand=1; r=2,5; c=5,8; fin r2c9; r1c8<>1.
- Code: Select all
123 28 38 | 6 7 5 | 4 129 129
4 5 7 | 9 12 3 | 6 128 128
12 9 6 | 4 8 12 | 37 5 37
-----------+----------+------------
6 3 5 | 8 9 12 | 12 7 4
9 7 4 | 3 12 6 | 8 12 5
8 1 2 | 5 4 7 | 9 3 6
-----------+----------+------------
5 4 9 | 2 3 8 | 17 6 17
23 28 1 | 7 6 9 | 5 4 38
7 6 38 | 1 5 4 | 23 289 2389
So (presumably) both can be discarded.
Is that a "known" situation? Finned x-wings seem comparitively rare, maybe 'symmetrical' finned x-wings are ridiculously rare...
cheers
S.

