I did this, logically, without ever finding, or even looking for the swordfish. I spotted this particular pattern, so I just kept looking for more and eventually I cracked the puzzle.

I was so impressed by the puzzle construction, I put it through SE just out of curiosity of the puzzle's difficulty, which was only 3.8, but very satisfying to solve.

I used Anduko 3 on my phone, and this was the first puzzle I tried.

- Code: Select all
`+----------------------+----------------------+----------------------+`

| 4 389 13689 | 2 7 139 | 36 5 368 |

| 1368 2 5 | 1368 1368 13 | 9 37 4 |

| 3689 389 7 | 3689 35689 4 | 36 2 1 |

+----------------------+----------------------+----------------------+

| 359 1 239 | 379 349 6 | 3457 8 237 |

| 35689 3789 23689 | 13789 13489 12379 | 134567 1347 2367 |

| 368 4 2368 | 5 138 1237 | 1367 9 2367 |

+----------------------+----------------------+----------------------+

| 7 5 1389 | 4 1369 139 | 2 13 39 |

| 2 39 4 | 1379 1359 13579 | 8 6 379 |

| 139 6 139 | 1379 2 8 | 1347 1347 5 |

+----------------------+----------------------+----------------------+

The pattern is a 3 corner pattern: 3 sets of pairs. Each pair has a common number, and an uncommon number. You solve the corner cell, by picking the uncommon number.

- Code: Select all

[1,2]...............[1,3]

[1,4]

The answer is "2" in the corner cell.

Is there a name for that technique?