Death Blossom

Extreme

A stem cell's each candidate maps to an ALS "petal"; the common candidate across all petals is eliminated from cells seeing all petals.

How It Works

A "stem" cell has multiple candidates; each candidate connects to a different ALS "petal". Whichever value the stem takes, the corresponding petal activates. If all petals share a common candidate Z, any cell seeing all petals can have Z eliminated.

A generalization of ALS-XZ; very rare in practice.

Example

481
29
26
59
73
56
3
59
2
17
368
17
15
49
58
7
16
56
14
368
49
12
48
25
15
46
76
14
29
16
3
679
679
39
16
37
16
14
28
23
49
17
56
8
15
17
45
16
12
839
14
25
57
46
97
46
12
14
15
3
48
25
18
14
35
29
76
14
58
29
Key cells of the techniqueCells where elimination is appliedCandidate to be placedEliminated candidate (crossed out)

Stem R5C5={3,7}. Petal-3: R2C5,R3C5 → {3,6,8}. Petal-7: R5C1,R5C2 → {7,6,9}. Common Z=6 → Eliminate 6 from cells seeing all petals.

Practice with a Real Puzzle

This 9×9 puzzle is solver-verified to require this technique on its solution path.

Expert25 givens