- Code: Select all
vvv vvv vvv
+----------------+-----------------+--------------+
| 148 589 1578 | 1478 6 147 | 2 49 3 |
| 14 6 3 | 124 124 9 | 5 8 7 |
| 2 89 78 | 5 478 3 | 14 6 19 |
+----------------+-----------------+--------------+
| 6 +25 245 | 247 3 +2457 | 9 1 8 | xxx
| 9 3 1458 | 148 148 145 | 7 2 6 |
| 18 7 128 | 128 9 6 | 3 5 4 |
+----------------+-----------------+--------------+
| 7 1 269 | 3 24 8 | 46 49 5 |
| 5 4 29 | 6 127 +127 | 8 3 +129 | xxx
| 3 +28 268 | 9 5 +124 | 146 7 +12 | xxx
+----------------+-----------------+--------------+
I marked the swordfish with + signs.
"vvv" marks the columns which are bare of candidate "2" except withing the swordfish pattern.
"xxx" marks the rows where you therefore can eliminate every "2" that is not in the swordfish columns (vvv).
Mac