At minute 12, you are doing quite well and the last straw is there for the taking: In block 2, you have a 3 and a 9 in rows 2 and 3. Where can they go in row 1 ? 39 remote pair in col 1 and 7, hence the 2 in r1c8 and the 1 in r3c8, etc. Sprint to the finish.
At minute 12, you are doing quite well and the last straw is there for the taking: In block 2, you have a 3 and a 9 in rows 2 and 3. Where can they go in row 1 ? 39 remote pair in col 1 and 7, hence the 2 in r1c8 and the 1 in r3c8, etc. Sprint to the finish.
Here's a path with a UR. I can't be bothered to look for an aternative just now (65 = row 6 column 5):
65, 54, 47, 32 (hidden paair in column),
36, 98 (hidden UR, boxes 6 and 9),
92, 82, 77, 78, 86,
15 (hidden single, owing to pair in row),
38, 21, 23, 11, 83,
17, 18, 58, 57, 87 (pairs in box 6),
89, 79, 51, 41, 59,
49, 66, 53, 12, 14,
62, 63, 67, 69, 27,
37, 29, 35, 94, 84,
24, 35, 44, 95, 75,
93, 91, 33, 31, 73,
85, 46, 45, 76, 81,
71.
Actually, I was forgetting the hidden single, which obviated the need for a UR:
15 instead of 98 (hidden single, owing to pair in row),
38, 21, 23, 51, 41,
63, 11, 98 (hidden DCE),
83, 17, 18, 57, 29,
58, 59, 27, 37, 25,
92 (hidden DRE),
82, 77, 49, 87, 66,
53, 62, 12, 14, 35,
24, 78, 86, 89, 79,
67, 69, 94, 95, 44,
84, 71, 81, 73, 85,
46, 45, 76, 75, 93,
91, 33, 31.
The 148 triple on row 1 clinched the deal, everything collapsed after that.
By checking rows and columns with 4 or more digits pairs and triples were exposed. After that it was not difficult. 13 mins. notation free.
NF 19m 15s