Funny puzzle (thanks docjohn !), solved in seven simple steps: XY-wings or loops, 2-fishes, L-wing and UR...
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| 139*# 5 349 | 1-39 e3489* 6 | 14789 2 1479 |
| 7 126 2349 | 12359 e23489* 1459-3 | 14589 4589 14569 |
| 8 126 249 | 1259 249 7 | 3 459 14569 |
+---------------------+--------------------------+-------------------------+
| b59# 38 7 | 4 1 a39# | 6 3589 2 |
| 2 34 59 | 7 6 8 | 1459 3459 1459 |
| 6 348 1 | 39# 5 2 | 489 7 49 |
+---------------------+--------------------------+-------------------------+
| 15 7 8 | 12569 249 1459 | 2459 4569 3 |
| 4 12 235 | 13569 7 1359 | 59 569 8 |
| c35* 9 6 | 8 d234* 45-3 | 2457 1 457 |
+---------------------+--------------------------+-------------------------+
1. Finned X-wing(*) (3)r1c1 = r9c1 - r9c5 = r12c5 => -3 r1c4
2. Turbot fish(#) (9)r1c1 = r4c1 - r4c6 = r6c4 => -9 r1c4; 4 placements + basics
3. XY-wing + transport (3=9)r4c6 - (9=5)r4c1 - (5=3)r9c1 - r9c5 = (3)r12c5 => -3 r2c6, r9c6*; 10 placements + basics
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| 39 5 349 | 1 8 6 | 479 2 79 |
| 7 16* 249 | 235 2349 459 | 1459 8 59-16* |
| 8 16* 249 | 25 249 7 | 3 459 16* |
+------------------+---------------------+----------------------+
| 59 8 7 | 4 1 3 | 6 59 2 |
| 2 4 59 | 7 6 8 | 159 3 159 |
| 6 3 1 | 9 5 2 | 8 7 4 |
+------------------+---------------------+----------------------+
| 1 7 8 | 256 249 459 | 245 456 3 |
| 4 2 35 | 356 7 1 | 59 569 8 |
| 35 9 6 | 8 234 45 | 2457 1 57 |
+------------------+---------------------+----------------------+
4. UR(16)r23c29 => -16 r2c9; 5 placements + basics
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| A39 5 34-9 | 1 8 6 | 47 2 D79 |
| 7 6 249 | 235 2349 459 | 1 8 59 |
| 8 1 249 | a25 249 7 | 3 b45 6 |
+------------------+---------------------+-------------------+
| 59 8 7 | 4 1 3 | 6 59 2 |
| 2 4 59* | 7 6 8 | 59* 3 1 |
| 6 3 1 | 9 5 2 | 8 7 4 |
+------------------+---------------------+-------------------+
| 1 7 8 | d26-5 249 459 | 24 c456 3 |
| 4 2 35* | 356 7 1 | 59* 569 8 |
| B35 9 6 | 8 234 4-5 | 247 1 C57 |
+------------------+---------------------+-------------------+
5. X-wing(*) (5)r58c37 => -5 r8c4
6. L-wing (5)r3c4 = (5-4)r3c8 = (4-6)r7c8 = (6)r7c4 => -5 r7c4
(a,b,c,d)
7. XY-loop (9=3)r1c1 - (3=5)r9c1 - (5=7)r9c9 - (7=9)r1c9@ => -5 r9c6, -9 r1c3; stte
(A,B,C,D)
