Passi risolutivi (31)
Passo 1
Hidden Singles
valore: 5.6
categoria doc: Getting_Started
2 in B9 is last in column/box
5 in F9 is last in row/column/box
6 in F2 is last in box
6 in G3 is last in column
7 in F7 is last in column
7 in G8 is last in box
9 in H9 is last in row/box
Passo 2
Hidden Singles
valore: 4.8
categoria doc: Getting_Started
7 in E4 is last in column/box
9 in D8 is last in box
Passo 3
Naked Pair
valore: 22
categoria doc: Naked_Candidates
Naked Pair 1/4 on cells {D3|E1} means
- 1/4 can be removed from D1
- 1/4 can be removed from D2
- 4 can be removed from F1
Passo 4
Naked Pair
valore: 21.9
categoria doc: Naked_Candidates
Naked Pair 1/4 on cells {E1|E9} means
- 4 can be removed from E6
Passo 5
Pointing Pairs
valore: 64.8
categoria doc: Intersection_Removal
Pair: between Box 6 and Col 9:
- 1 can be removed from C9
- 1 can be removed from G9
Passo 6
Pointing Pairs
valore: 63.5
categoria doc: Intersection_Removal
Pair: between Box 9 and Row J:
- 1 can be removed from J2
- 1 can be removed from J3
- 1 can be removed from J4
Passo 7
Hidden Singles
valore: 4.1
categoria doc: Getting_Started
1 in D3 is last in column
1 in H4 is last in column/box
Passo 8
Naked Singles
valore: 1.9
categoria doc: Getting_Started
Last candidate 4 in E1 changed to solution
Passo 9
Naked Singles
valore: 1.9
categoria doc: Getting_Started
Last candidate 1 in E9 changed to solution
Passo 10
Line/Unit Reduction
valore: 75.4
categoria doc: Intersection_Removal
Line/Box Reduction: 6s in box 2 remove the following in the same box:
- 6 can be removed from B6
- 6 can be removed from C5
Passo 11
Naked Triple
valore: 74.3
categoria doc: Naked_Candidates
Naked Triple 4/7/8 on cells {H1|H2|J3} means
- 8 can be removed from G1
- 4 can be removed from J2
Passo 12
X-Wing
valore: 108.9
categoria doc: X_Wing_Strategy
(Col->Row) 5 taken off C2, based on AJ26
(Col->Row) 5 taken off G2, based on AJ26
(Col->Row) 5 taken off G6, based on AJ26
Passo 13
Grouped X-Cycle
valore: 396.4
categoria doc: Grouped_X_Cycles
X-CYCLE on 8 ((w.Groups) Discontinuous Alternating Nice Loop, length 6):
+8[A8]-8[A3]+8[J3]-8[J7]+8[A7|C7]-8[A8]
- Contradiction: When A8 is set to 8 the chain implies it cannot be 8 - it can be removed
Passo 14
WXYZ Wing
valore: 357.6
categoria doc: WXYZ_Wing
WXYZ Wing Type 1: The four cells {J8,A8,J3,J7} contain in total 1/3/4/8 with the hinge on J8.
Non-Restricted candidate 4 determines the 'wing' cells (in yellow) and one of those 4s must be true. Therefore...
- 4 can be removed from A3
Last candidate 8 in A3 changed to solution
Passo 15
Naked Singles
valore: 1.6
categoria doc: Getting_Started
Last candidate 9 in A7 changed to solution
Last candidate 4 in J3 changed to solution
Passo 16
Naked Singles
valore: 1.5
categoria doc: Getting_Started
Last candidate 7 in H2 changed to solution
Passo 17
Naked Singles
valore: 1.5
categoria doc: Getting_Started
Last candidate 8 in H1 changed to solution
Passo 18
Naked Singles
valore: 1.5
categoria doc: Getting_Started
Last candidate 6 in H5 changed to solution
Passo 19
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 9 in E5 changed to solution
Last candidate 4 in H6 changed to solution
Passo 20
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 6 in E6 changed to solution
Passo 21
Hidden Singles
valore: 2.4
categoria doc: Getting_Started
4 in D9 is last in row
4 in F4 is last in column/box
7 in D1 is last in row/column/box
9 in B6 is last in column/box
9 in C2 is last in row
Passo 22
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 8 in F8 changed to solution
Passo 23
Hidden Singles
valore: 1.9
categoria doc: Getting_Started
4 in A2 is last in column/box
4 in C8 is last in row
8 in B4 is last in row
Passo 24
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 3 in A8 changed to solution
Passo 25
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 2 in A4 changed to solution
Last candidate 8 in C9 changed to solution
Last candidate 1 in J8 changed to solution
Passo 26
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 5 in A6 changed to solution
Last candidate 6 in B8 changed to solution
Last candidate 1 in C7 changed to solution
Last candidate 3 in G9 changed to solution
Last candidate 3 in J4 changed to solution
Last candidate 8 in J7 changed to solution
Passo 27
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 6 in C4 changed to solution
Last candidate 3 in C5 changed to solution
Last candidate 2 in J6 changed to solution
Passo 28
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 5 in C1 changed to solution
Last candidate 2 in F5 changed to solution
Last candidate 8 in G6 changed to solution
Last candidate 5 in J2 changed to solution
Passo 29
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 8 in D5 changed to solution
Last candidate 3 in D6 changed to solution
Last candidate 3 in F1 changed to solution
Last candidate 5 in G5 changed to solution
Passo 30
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 1 in B1 changed to solution
Last candidate 2 in D2 changed to solution
Passo 31
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 3 in B2 changed to solution
Last candidate 2 in G1 changed to solution
Last candidate 1 in G2 changed to solution