Hi,
I submit this puzzle to your resolution.
.1....2..9..5..74.....4...8...7..6..46..3..72..1..2...7...5.....58..7..9..6....1.
Good resolution.
Robert
+-------------------------+-------------------------+-------------------------+
| 56 1 4 | 3689 7 3689 | 2 3569 356 |
| 9 8 23 | 5 c126 136 | 7 4 d136 |
| 56 23 7 | 12369 4 1369 | 139 3569 8 |
+-------------------------+-------------------------+-------------------------+
| 238 239 2359 | 7 189 eb14589 | 6 389 d134 |
| 4 6 59 | 189 3 a1589 | 189 7 2 |
| 38 7 1 |b4689 b689 2 | 3489 3589 345 |
+-------------------------+-------------------------+-------------------------+
| 7 2349 239 | 123469 5 13469 | 348 2368 346 |
| 1 5 8 | 2346 c26 7 | 34 236 9 |
| 23 2349 6 | 23489 289 3489 | 5 1 7 |
+-------------------------+-------------------------+-------------------------+
+-------------------------+-------------------------+-------------------------+
| 56 1 4 | 3689 7 3689 | 2 3569 356 |
| 9 8 *23 | 5 *126 136 | 7 4 136 |
| 56 *23 7 | 12369 4 1369 | 139 3569 8 |
+-------------------------+-------------------------+-------------------------+
|*238 *23 5 | 7 189 1489 | 6 389 134 |
| 4 6 9 | 18 3 5 | 18 7 2 |
| 38 7 1 | 4689 689 2 | 3489 3589 345 |
+-------------------------+-------------------------+-------------------------+
| 7 49 23 | 123469 5 13469 | 348 2368 346 |
| 1 5 8 | 2346 #26 7 | 34 236 9 |
|*23 49 6 |#23489 *289 3489 | 5 1 7 |
+-------------------------+-------------------------+-------------------------+
+----------------------+----------------------+----------------------+
| 56 1 4 | 3689 7 3689 | 2 3569 356 |
| 9 8 23 | 5 126 136 | 7 4 136 |
| 56 23 7 | 12369 4 1369 | 139 3569 8 |
+----------------------+----------------------+----------------------+
| 238 23 5 | 7 b189 b1489 | 6 a389 134 |
| 4 6 9 |c18 3 5 |c18 7 2 |
| 38 7 1 | 4689 d689 2 | 3489 3589 345 |
+----------------------+----------------------+----------------------+
| 7 49 23 | 13469 5 13469 | 348 2368 346 |
| 1 5 8 | 346 e26 7 | 34 236 9 |
| 23 49 6 | 23489 89 3489 | 5 1 7 |
+----------------------+----------------------+----------------------+
+----------------------+-------------------------+----------------------+
| 56 1 4 | 3689 7 3689 | 2 3569 356 |
| 9 8 23 | 5 c126 136 | 7 4 d136 |
| 56 23 7 | 12369 4 1369 | 139 3569 8 |
+----------------------+-------------------------+----------------------+
| 238 239 2359 | 7 189 f14589 | 6 389 e134 |
| 4 6 59 | 189 3 1589 | 189 7 2 |
| 38 7 1 | a689-4 b689 2 | 3489 3589 345 |
+----------------------+-------------------------+----------------------+
| 7 2349 239 | 123469 5 13469 | 348 2368 346 |
| 1 5 8 | 2346 c26 7 | 34 236 9 |
| 23 2349 6 | 23489 289 3489 | 5 1 7 |
+----------------------+-------------------------+----------------------+
+------------------+------------------------+----------------------+
| 56 1 4 | 3689 7 3689 | 2 3569 356 |
| 9 8 d23 | 5 c126 136 | 7 4 136 |
| 56 e23 7 | 12369 4 1369 | 139 3569 8 |
+------------------+------------------------+----------------------+
| 238 2-3 5 | 7 b189 4 | 6 389 a13 |
| 4 6 9 | 18 3 5 | 18 7 2 |
| 38 7 1 | 689 689 2 | 3489 3589 345 |
+------------------+------------------------+----------------------+
| 7 49 23 | 123469 5 1369 | 348 2368 346 |
| 1 5 8 | 2346 26 7 | 34 236 9 |
| 23 49 6 | 23489 289 389 | 5 1 7 |
+------------------+------------------------+----------------------+
(1)r5c7 *
||
(2-8)r7c8 = r7c7 - (8)r9c7
|| ||
|| (9)r9c7 -
|| |
(2)r7c2 - (2=39)r34c2 - - - - (9=5)r5c3 - r4c3 = (54)r4c69 *
||
(2)r7c3 - r2c3
|| \\
|| (2-1)r2c5 = (1)r4c5 *
|| //
(2)r7c4 - r3c4
---------------
=> -1 r4c9; ste