- Code: Select all
+----------------+--------------------+-----------------+
| 1 6(5) 3 | 8 9 7 | 4 2 6(5) |
| 2(5) 7 8 | 4 23(5) 6 | 9(5) 39 1 |
| 9 256 4 | 1 235 25 | 8 7 356 |
+----------------+--------------------+-----------------+
| 28(5) 4 6 | 2(5) 7 9 | 1 38 3(5) |
| 3 2(5) 7 | 6 1 28(5) | 29(5) 89 4 |
| 258 1 9 | 3 8-5 4 | 25 6 7 |
+----------------+--------------------+-----------------+
| 6 9 2 | 7 4 1 | 3 5 8 |
| 4 8 5 | 9 6 3 | 7 1 2 |
| 7 3 1 | 25 258 258 | 6 4 9 |
+----------------+--------------------+-----------------+
In my Subsets thread Pjb recently wrote:
If you have trouble with jellyfish as I do, then a series of simple AICs will suffice (some of them skyscrapers):
1.Chain: (2)r2c5 = r2c1 - r4c1 = r4c4 => -2 r6c5
2.Chain: (5=2)r3c6 - r5c6 = r4c4 - (2=5)r9c4 => -5 r9c6
3.Chain: (5=9)r2c7 - r2c8 = (9-8)r5c8 = r5c6 - (8=5)r6c5 => -5 r2c5, r6c7
4.Line/Box: 5s at r3c56 => -5 r3c29
5.Chain: (2=5)r2c1 - (5=9)r2c7 - (9=5)r5c7 - (5=2)r5c2 => -2 r3c2, r4c1 => stte
I can follow the logic, with some difficulty, but I just don't know the intended meaning of a lot of these terms.
I would tend to describe Chain1 with a series of logic steps, something like:
r2c5<>2 => 2r2c1 => r4c1<>2 => 2r4c4 => r6c5<>2
OR 2r2c5 => r6c5<>2 Delete 2 as candidate from r6c5.
Hodoku says my prefered notation tends to be used in forcing chains, while this type above is more for AICs, but are they all that distinct?
Is there a thread which explains the standard notations for Chains used in this forum?
