I propose this puzzle for your resolution.
Robert
..25.......5...6.78...965..7..8..1..1.6.47..8..3..5.76...3....2..8.....4.....431.
puzzle: Show
after singles and intersections:
3469 134679 2 5 137 18 489 489 139
349 1349 5 124 123 128 6 2489 7
8 1347 147 1247 9 6 5 24 13
7 2 49 8 6 3 1 459 59
1 5 6 29 4 7 29 3 8
49 8 3 129 12 5 249 7 6
f456-9 fd*1467-9 fd*147-9 3 157 e1+9 789 5689 2
b+23569 c1+3679 8 1267 1257 129 79 569 4
a2+569 f67*9 f7*9 267 8 4 3 1 a±5×9
r9n5{c9 c1} - c1n2{r9 r8} - r8n3{c1 c2} - b7n1{r8c2 r7c2r7c3} - r7c6{n1 n9} - b7n9{r7c1r7c2r7c3 r9c2r9c3} => r9c9 <> 9
singles: ( n9r6c1 n9r5c4 n5r4c8 n4r4c3 n4r6c7 n2r5c7 n9r4c9 n5r9c9 )
intersections: r9n9{c2c3} => r7c2 r7c3 r8c2 <> 9
single: ( n9r9c3 )
346 134679 2 5 137 d(1+8) d(8+9) 489 d(+1)3
34 1349 5 124 123 128 6 2489 7
8 c1-347 17 1247 9 6 5 24 c1+3
7 2 4 8 6 3 1 5 9
1 5 6 9 4 7 2 3 8
9 8 3 12 12 5 4 7 6
a45*6 a14*67 b(+17) 3 157 19 e(7+8)9 a±6(×8+9) 2
2356 b(1+37)6 8 1267 1257 129 e(+7)9 69 4
26 b(+7)6 9 267 8 4 3 1 5
r7n6{c8 c1c2} - [ r9c2{n6 n7} r7c3{n7 n1} r8c2{n1n6n7 n3} ] - r3n3{c2 c9} - [ r1c9{n3 n1} r1c6{n1 n8} r1c7{n8 n9} ] - [ r8c7{n9 n7} r7c7{n7n9 n8} - r7c8{n6n8 n9} ] => r7c8 <> 8
r1n7{c5 c2} - r9n7{c2 c4} => r3c4 r7c5 r8c5 <> 7
ste.
+--------------------------+----------------------+--------------------+
| 3469 134679 2 | 5 137 18 | 489 489 13 |
| 349 1349 5 | 124 123 128 | 6 2489 7 |
| 8 1347 147 | 1247 9 6 | 5 24 13 |
+--------------------------+----------------------+--------------------+
| 7 2 49 | 8 6 3 | 1 459 59 |
| 1 5 6 | 29 4 7 | 29 3 8 |
| 49 8 3 | 129 12 5 | 249 7 6 |
+--------------------------+----------------------+--------------------+
| f4569 f14679 f1479 | 3 157 e'19 | 789 5689 2 |
|c'23569 c'13679 8 | 1267 1257 d'129 | b79 b569 4 |
| 269-5 f679 f79 | 267 8 4 | 3 1 a59 |
+--------------------------+----------------------+--------------------+
+-----------------------+----------------------+--------------------+
| 346 134679* 2 | 5 137* 18 | 89 489 13 |
| 34 1349 5 | 124 123 128 | 6 2489 7 |
| 8 1347 17 | 124-7 9 6 | 5 24 13 |
+-----------------------+----------------------+--------------------+
| 7 2 4 | 8 6 3 | 1 5 9 |
| 1 5 6 | 9 4 7 | 2 3 8 |
| 9 8 3 | 12 12 5 | 4 7 6 |
+-----------------------+----------------------+--------------------+
| 456 1467 17 | 3 15-7 19 | 789 689 2 |
| 2356 1367 8 | 1267 125-7 129 | 79 69 4 |
| 26 67* 9 | 267* 8 4 | 3 1 5 |
+-----------------------+----------------------+--------------------+
+-------------------+-------------------+-----------------+
| a36 b1369 2 | 5 7 18 | 89 4 13 |
| 4 19 5 | 12 3 128 | 6 89 7 |
| 8 c17-3 17 | 4 9 6 | 5 2 13 |
+-------------------+-------------------+-----------------+
| 7 2 4 | 8 6 3 | 1 5 9 |
| 1 5 6 | 9 4 7 | 2 3 8 |
| 9 8 3 | 12 12 5 | 4 7 6 |
+-------------------+-------------------+-----------------+
| 56 4 17 | 3 15 9 | 78 68 2 |
| 35 13 8 | 67 125 12 | 79 69 4 |
| 2 c67 9 | 67 8 4 | 3 1 5 |
+-------------------+-------------------+-----------------+