Ron, interesting observation about the relationships between the base set, the cover set, and the difference between them. Also, its going to take me a while to get use to Frankenfish with a box in the base set, but you are correct about the swordfish. Of course the fact that the same eliminations can be done so many different ways begs the question, Is there a minimal set of fish which should be defined?
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X-wing r26/c29:
...7..8..7..5..6......8...2.2..4.....3......7..19..5..2...5...14....3........1983
+-------------------+------------+----------------+
| 3 56-4 2 | 7 9 46 | 8 1 5-4 |
| 7 49* 8 | 5 1 2 | 6 3 49* |
| 1 569-4 456 | 3 8 46 | 47 4579 2 |
+-------------------+------------+----------------+
| 5689 2 567 | 1 4 578 | 3 69 689 |
| 589 3 45 | 2 6 58 | 1 49 7 |
| 68 467* 1 | 9 3 78 | 5 2 468* |
+-------------------+------------+----------------+
| 2 8 3 | 6 5 9 | 47 47 1 |
| 4 1 9 | 8 7 3 | 2 56 56 |
| 56 567 567 | 4 2 1 | 9 8 3 |
+-------------------+------------+----------------+
. * . | . . . | . . *
/ X / | / / / | / / X
. * . | . . . | . . .
------+-------+------
. . . | . . . | . . .
. . . | . . . | . . .
/ X / | / / / | / / X
------+-------+------
. . . | . . . | . . .
. . . | . . . | . . .
. . . | . . . | . . .
X-wing c58/r27:
5..21..3.96...8....1.3.....6..15.......8.92.......3.1..86...9..1...3.57..2.......
+-----------+------------------+-----------------+
| 5 4 8 | 2 1 67 | 67 3 9 |
| 9 6 3 | 57-4 47* 8 | 1 24* 257-4 |
| 2 1 7 | 3 9 456 | 46 8 456 |
+-----------+------------------+-----------------+
| 6 37 2 | 1 5 47 | 8 9 347 |
| 4 37 1 | 8 6 9 | 2 5 37 |
| 8 5 9 | 47 2 3 | 467 1 467 |
+-----------+------------------+-----------------+
| 3 8 6 | 57-4 47* 157-4 | 9 24* 12-4 |
| 1 9 4 | 6 3 2 | 5 7 8 |
| 7 2 5 | 9 8 14 | 3 6 14 |
+-----------+------------------+-----------------+
. . . | . / . | . / .
. . . | * X . | . X *
. . . | . / . | . / .
------+-------+------
. . . | . / . | . / .
. . . | . / . | . / .
. . . | . / . | . /. .
------+-------+------
. . . | * X * | . X *
. . . | . / . | . / .
. . . | . / . | . / .