Passi risolutivi (25)
Passo 1
Hidden Singles
valore: 5.3
categoria doc: Getting_Started
4 in C8 is last in column/box
4 in E4 is last in column
4 in H5 is last in box
4 in J3 is last in row
7 in D9 is last in column/box
Passo 2
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 8 in E5 changed to solution
Passo 3
Naked Singles
valore: 2.3
categoria doc: Getting_Started
Last candidate 9 in E6 changed to solution
Passo 4
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 1 in D4 changed to solution
Passo 5
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 7 in F4 changed to solution
Passo 6
Hidden Singles
valore: 4
categoria doc: Getting_Started
4 in A2 is last in row/column/box
5 in G5 is last in column
8 in A4 is last in box
8 in F8 is last in row/box
9 in D2 is last in row/box
Passo 7
Naked Singles
valore: 1.7
categoria doc: Getting_Started
Last candidate 3 in G4 changed to solution
Passo 8
Naked Singles
valore: 1.6
categoria doc: Getting_Started
Last candidate 9 in C4 changed to solution
Passo 9
Hidden Singles
valore: 2.8
categoria doc: Getting_Started
2 in E3 is last in box
3 in A3 is last in row
3 in C6 is last in column/box
3 in E7 is last in box
3 in J8 is last in column
5 in D6 is last in row
6 in F6 is last in row
8 in B7 is last in row/box
8 in G6 is last in row
8 in H9 is last in column
Passo 10
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 5 in F3 changed to solution
Passo 11
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 1 in F1 changed to solution
Passo 12
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 3 in F2 changed to solution
Passo 13
Hidden Singles
valore: 2
categoria doc: Getting_Started
2 in C9 is last in column
7 in C5 is last in row
Passo 14
Naked Pair
valore: 8.5
categoria doc: Naked_Candidates
Naked Pair 5/6 on cells {A9|C7} means
- 5/6 can be removed from A7
- 6 can be removed from B8
Passo 15
Pointing Pairs
valore: 25.2
categoria doc: Intersection_Removal
Pair: between Box 7 and Row G:
- 6 can be removed from G8
Passo 16
Hidden Singles
valore: 1.7
categoria doc: Getting_Started
6 in D8 is last in column
Passo 17
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 2 in D7 changed to solution
Passo 18
X-Wing
valore: 45.4
categoria doc: X_Wing_Strategy
(Col->Row) 5 taken off J7, based on CH27
Passo 19
Y-Wing
valore: 58.3
categoria doc: Y_Wing_Strategy
Y-Wing pattern. Hinge: J1 (5/7), wings A1 H3, therefore
- 9 can be removed from B3
- 9 can be removed from G1
Last candidate 2 in G1 changed to solution
Passo 20
Hidden Singles
valore: 1.2
categoria doc: Getting_Started
2 in B2 is last in row/column/box
2 in H8 is last in row/column/box
Passo 21
Bi-value Universal Grave
valore: 33.8
categoria doc: BUG
BUG+1 found in H7, 1 must be the solution
All other incomplete cells contain two candidates apart from H7. Other candidates in H7 would lead to zero, two or more solutions so they can be removed.
Last candidate 1 in H7 changed to solution
Passo 22
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 9 in A7 changed to solution
Last candidate 9 in G8 changed to solution
Last candidate 5 in H2 changed to solution
Last candidate 7 in H6 changed to solution
Last candidate 6 in J7 changed to solution
Passo 23
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 5 in A1 changed to solution
Last candidate 1 in B8 changed to solution
Last candidate 6 in C2 changed to solution
Last candidate 5 in C7 changed to solution
Last candidate 6 in G3 changed to solution
Last candidate 9 in H3 changed to solution
Last candidate 7 in J1 changed to solution
Last candidate 1 in J6 changed to solution
Last candidate 5 in J9 changed to solution
Passo 24
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 6 in A9 changed to solution
Last candidate 9 in B1 changed to solution
Last candidate 7 in B3 changed to solution
Last candidate 6 in B5 changed to solution
Last candidate 1 in G2 changed to solution
Passo 25
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 1 in A5 changed to solution