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Ted,

The 2nd ALS is of the doubly-linked variety - 2 RCCs locking the ALSs together. You can think of it as a closed loop if that helps. Basically, the rules for what can be eliminated are greatl ...

Ted,

Nice! If I reproduced this correctly, the following PM appears fairly early in basics prior to any XY wing or coloring etc.: *----------------------------------------------------------------- ...

Basics + coloring until I hit the following position:*-----------------------------------------------------------*
| 1 279 279 | 39 8 2359 | 4 269 2569 |
| 29 8 6 ...

After basics and an XY-Wing 123 pivot at r7c8 + r1c8 & r7c6 => r1c6 <> 2 I arrived at:
*--------------------------------------------------------------------*
| 7 9 256 | ...

Basics +
kite (7) r3c59 and r19c8 => r9c5 <> 7
UR Type 4 29 r57c23 => r57c3 <> 2
followed by 2 WXYZ-Wings
*-----------------------------------------------------------*
...

Danny,

Mea culpa! I was working on the (erroneous) assumption that SSTS was the de-facto standard for placing a puzzle into a known starting grid PM.

So, how do I interpret the ratings and perm ...

after SSTS:
UR type 3 7/9 r13c57 + r9c7 (ls 28 in c7) => r8c7=9
BUG+1 r7c9 => r7c9=2

Ron,

How about: (5=276)ALS:b2x345 - (6=7)r1c7 - (726=5)ALS:r6c347 => r1c4 <> 5

I'm not that versed on Eureka notation, so if I goofed, mea culpa. I used the Sudopedia as a guide for th ...

Death Blossom or ALS chain length 3 or ALS XY-Wing:

DB stem cell r1c7 <67> : als 1) 6 - b2x345 <2567> als 2) 7 - r6c347 <2567> => r1c4 <> 5 -- sste

Cheers,
Paul

Ron,

I guess I view DBs as patterns rather than chains/nets. But being of the school that believes there's little (if any) practical difference between the two, I'll concede that the example is a ...

Bud,

Your last example, 2 ALSs linked via a conjugate, is what I would call a Death Blossom. I'm not sure where it was proposed, but it's not necessary for a DB to be confined to a single stem cel ...