ALS-Wing

ALS-Wing is an extension of XY-Wing and DeathBlossom, and is an algorithm that uses the effect of ALS spreading when it becomes a LockedSet.

• Expanding XY-Wing bivalue cells to ALS => DeathBlossom
• Connection with stem cells and overlap with ALS possible => DeathBlossomEx
• Extending the effect of weak links to Stem Cells => ALS-Wing

The ALS-Wing "lockedSet" is explained in the following diagram.
Focus on a cell (stem cell) and select the ALS connected to the cell (weak link).
Next, select cell #digit(fake cell digit) to change ALS to LockedSet.

1. [C]If cell#digit is true,
2. [B]ALS changes to LockedSet,
3. If the effect of LockedSet [B->A] is that all the candidate digits in cell [A] are negative,
   (The effect of a weak link from B to A may be multiple #digits.)
4. [C]Cell #digit is not true.

The basic form of ALS-Wing is shown here, and can be extended as follows. These are independent and can be extended simultaneously.

• The fake cell digit and the Stem-cell digits are a weak link.[connected type]
• It consists of multiple ALSs that are weakly linked to the Stem-cell.
• There is overlap between multiple ALS types[overlapping type]

●ALS-Wing examole

ALS_Wing
Stem Cell: r4c7
ALS_1: r4c4 #68
ALS_2: r3c137 #2469
Eliminated: r3c4 #6

7.1..9..8.52...19..8...3.574.3.5.......2.1.......3.7.519.7...3..37...68.8..3..9.1
2.9..3..8.17...63..8...6.259.5.6.......3.2.......9.3.114.6...9..53...48.7..4..2.6