challenge myself with a bunch of hard puzzles. I got stuck on this one:
- Code: Select all
- ------------------------------
 | | 7 | |
 | 1 4 | 5 9 | |
 | 7 9 | 1 | 8 |
 ------------------------------
 | 7 | | 5 |
 | | 3 4 | 6 |
 | | 2 | 9 |
 ------------------------------
 | | 7 | |
 | 2 | 4 | 1 |
 | 4 3 | 9 5 | |
 ------------------------------
I got as far as
- Code: Select all
- ------------------------------------------------------------------------------------
 | 23568 23568 568| 7 3468 2368| 59 12349 123456|
 | 1 2368 4| 5 368 9| 367 237 2367|
 | 2356 7 9| 26 346 1| 8 234 23456|
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 | 2368 23468 7| 168 9 68| 34 5 138|
 | 589 589 158| 3 7 4| 2 6 18|
 | 368 3468 168| 168 2 5| 347 1378 9|
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 | 5689 5689 568| 268 1 7| 59 23489 234568|
 | 7 5689 2| 4 368 368| 1 89 568|
 | 4 1 3| 9 5 268| 67 278 2678|
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Pointers to the next move is appreciated!



 . I thought it also worth pointing out the alternative "clue" to this puzzle appeared in the same row 7 being the naked quad of [5689] [5689] [568] [59] in columns 1237. After these candidates are eliminated from other cells in this row a naked single [2] fills cell r7c4 leaving the naked pair [34] in r7c8 and r7c9 as spotted by tarek. It seems a personal observation as to whether it's easier to spot a naked quad or a hidden pair!
 . I thought it also worth pointing out the alternative "clue" to this puzzle appeared in the same row 7 being the naked quad of [5689] [5689] [568] [59] in columns 1237. After these candidates are eliminated from other cells in this row a naked single [2] fills cell r7c4 leaving the naked pair [34] in r7c8 and r7c9 as spotted by tarek. It seems a personal observation as to whether it's easier to spot a naked quad or a hidden pair!