Thank you for sharing your very nice solutions!
My path for this puzzle was complex (to say the least). I was pleased to learn about those better ways missed.
In particular, in my first solve I did use the UR (for sure not in the second or even third move!)
but I did not take notes of the moves, and could not recollect the path, so I search for a new way
and got entangled into that solution path!
- Code: Select all
,-----------------------------------------------------------,
| 1 237 8 | 69 b69 25 | 2347 2345 247 |
| 4 27 5 | 3 1 8 | 6 9 27 |
| 6 23 9 | 7 4 25 | 238 2358 1 |
|-------------------+-------------------+-------------------|
| 257 1 27 | 456 fa367 f347 | 9 e234 8 |
| 9 6 3 | 8 2 14 | 14 7 5 |
| 2578 58 4 | 15 f37 9 | 123 e23 6 |
|-------------------+-------------------+-------------------|
| 2378 9 6 | 24 5 347 | 2478 1 247 |
| 2378 c48 127 | 124 b378 6 | 5 d248 9 |
| 2578 458 127 | 1249 b789 147 | 2478 6 3 |
'-----------------------------------------------------------'
1. (6)r4c5 = (698)r198c5 - (8=42)r8c28 - (2=34)r46c8 - (4=376)b5p238 => +6 r4c5 [3 more placements]
---
- Code: Select all
,----------------------------------------------------------------,
| 1 237 8 | 6 9 25 | 2347 2345 247 |
| 4 27 5 | 3 1 8 | 6 9 27 |
| 6 23 9 | 7 4 25 | 238 2358 1 |
|---------------------+--------------------+---------------------|
| 257 1 Z27 | 45 6 Z37 | 9 234 8 |
| 9 6 3 | 8 2 14 | 14 7 5 |
| 2578 a58 4 |aB15 7-3 9 |aC123 baC23 6 |
|---------------------+--------------------+---------------------|
| 2378 9 6 | 24 5 347 | 2478 1 247 |
|y(2)378 b48 Y1(2)7 | A1(2)4 z378 6 | 5 ba'(2)48 9 |
| 2578 458 127 | 9 78 147 | 2478 6 3 |
'----------------------------------------------------------------'
2. Kraken Row (2)r8c1348 => -3 r6c5
||(2-3)r8c1 = (3)r8c5
||(2)r8c3 - (2=73)r4c36
||(2-1)r8c4 = (1)r6c4 - (1=23)r6c78
||(2-8)r8c8 = [ALS Y-wing (3=2158)r6c2478 - (8=4)r8c2 - (4=23)r68c8]
(the original move was 2 almost chains removing 7 and then 8 from r8c5)
---
- Code: Select all
,--------------------------------------------------,
| 1 37 8 | 6 9 2 | 347 5 47 |
| 4 27 5 | 3 1 8 | 6 9 27 |
| 6 23 9 | 7 4 5 | 23 8 1 |
|----------------+----------------+----------------|
| 257 1 27 | 5-4 6 3 | 9 a24 8 |
| 9 6 3 | 8 2 d14 | 14 7 5 |
| 258 c58 4 |d15 7 9 | 12 3 6 |
|----------------+----------------+----------------|
| 3 9 6 | 24 5 47 | 8 1 247 |
| 278 c48 127 | 124 3 6 | 5 b24 9 |
| 25 45 12 | 9 8 147 | 247 6 3 |
'--------------------------------------------------'
3. (4)r4c8 = r8c8 - (4=85)r68c2 - (5=14)b5p67 => -4 r4c4; ste