Passi risolutivi (36)
Passo 1
Hidden Singles
valore: 5.6
categoria doc: Getting_Started
4 in C2 is last in row/box
8 in C8 is last in column/box
Passo 2
Naked Pair
valore: 27
categoria doc: Naked_Candidates
Naked Pair 5/9 on cells {D5|F5} means
- 5 can be removed from B5
- 5 can be removed from D6
- 9 can be removed from E5
- 5 can be removed from F4
Last candidate 1 in E5 changed to solution
Passo 3
Pointing Pairs
valore: 78
categoria doc: Intersection_Removal
Pair: between Box 6 and Col 7:
- 5 can be removed from B7
- 5 can be removed from C7
Passo 4
Pointing Pairs
valore: 77.2
categoria doc: Intersection_Removal
Pair: between Box 1 and Col 1:
- 9 can be removed from E1
- 9 can be removed from G1
Passo 5
Rectangle Elimination
valore: 127.9
categoria doc: Rectangle_Elimination
If +1[A6] then -1[H6] forcing +1[H7] which removes all 1s from box 3, so A6 cannot be 1
Last candidate 7 in A6 changed to solution
Passo 6
Naked Singles
valore: 2.4
categoria doc: Getting_Started
Last candidate 8 in D6 changed to solution
Passo 7
Naked Singles
valore: 2.4
categoria doc: Getting_Started
Last candidate 4 in E6 changed to solution
Passo 8
Naked Singles
valore: 2.3
categoria doc: Getting_Started
Last candidate 3 in E4 changed to solution
Passo 9
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 7 in F4 changed to solution
Passo 10
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 9 in F2 changed to solution
Passo 11
Naked Singles
valore: 2.1
categoria doc: Getting_Started
Last candidate 5 in F5 changed to solution
Passo 12
Naked Singles
valore: 2
categoria doc: Getting_Started
Last candidate 9 in D5 changed to solution
Passo 13
Hidden Singles
valore: 3.6
categoria doc: Getting_Started
1 in B4 is last in box
4 in F7 is last in row/box
5 in D7 is last in row/column/box
9 in A8 is last in column
9 in E9 is last in row/box
9 in G3 is last in row/column/box
Passo 14
Naked Singles
valore: 1.6
categoria doc: Getting_Started
Last candidate 6 in A1 changed to solution
Passo 15
Naked Singles
valore: 1.5
categoria doc: Getting_Started
Last candidate 3 in A9 changed to solution
Passo 16
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 1 in A7 changed to solution
Passo 17
Hidden Singles
valore: 2.6
categoria doc: Getting_Started
1 in H6 is last in row
3 in H7 is last in column
5 in B9 is last in row
9 in C1 is last in row/column/box
Passo 18
Hidden Singles
valore: 2.3
categoria doc: Getting_Started
3 in G1 is last in row/column/box
Passo 19
Hidden Singles
valore: 2.2
categoria doc: Getting_Started
5 in J1 is last in column/box
Passo 20
Naked Pair
valore: 10.6
categoria doc: Naked_Candidates
Naked Pair 7/8 on cells {B1|B3} means
- 7 can be removed from B7
Passo 21
Hidden Singles
valore: 2.1
categoria doc: Getting_Started
7 in C7 is last in column
Passo 22
W-Wing
valore: 48.8
categoria doc: W_Wings
W-Wing (double) (a.k.a.Remote Pair Chain).
Either 2 is in C9 and 6 is in H5 or vice versa. They are connected through mutual pairs of 2/6 in B7/B5, therefore
- 2/6 can be removed from H9
Passo 23
Simple Colouring
valore: 94.9
categoria doc: Singles_Chains
(RULE 4): Uncoloured candidate 2 in G8 can see two different coloured candidates of 2 elsewhere.
(RULE 4): Uncoloured candidate 2 in H3 can see two different coloured candidates of 2 elsewhere.
Passo 24
Naked Pair
valore: 9.2
categoria doc: Naked_Candidates
Naked Pair 1/6 on cells {G2|G8} means
- 6 can be removed from G4
- 6 can be removed from G9
Passo 25
X-Wing
valore: 54.5
categoria doc: X_Wing_Strategy
(Col->Row) 2 taken off J9, based on CG69
Passo 26
X-Wing
valore: 53.6
categoria doc: X_Wing_Strategy
(Col->Row) 2 taken off E3, based on FJ38
Passo 27
X-Wing
valore: 51.2
categoria doc: X_Wing_Strategy
(Row->Col) 6 taken off J2, based on CJ49
(Row->Col) 6 taken off J3, based on CJ49
(Row->Col) 6 taken off J8, based on CJ49
Passo 28
X-Wing
valore: 50.3
categoria doc: X_Wing_Strategy
(Row->Col) 6 taken off D3, based on DG28
Passo 29
Y-Wing
valore: 66
categoria doc: Y_Wing_Strategy
Y-Wing pattern. Hinge: E3 (6/8), wings B3 D2, therefore
- 7 can be removed from D3
Last candidate 3 in D3 changed to solution
Passo 30
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 6 in D8 changed to solution
Last candidate 2 in F3 changed to solution
Passo 31
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 7 in D2 changed to solution
Last candidate 8 in E1 changed to solution
Last candidate 2 in E7 changed to solution
Last candidate 3 in F8 changed to solution
Last candidate 1 in G8 changed to solution
Passo 32
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 7 in B1 changed to solution
Last candidate 6 in B7 changed to solution
Last candidate 6 in E3 changed to solution
Last candidate 6 in G2 changed to solution
Last candidate 1 in J2 changed to solution
Last candidate 2 in J8 changed to solution
Passo 33
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 8 in B3 changed to solution
Last candidate 2 in B5 changed to solution
Last candidate 2 in C9 changed to solution
Last candidate 4 in G9 changed to solution
Last candidate 2 in H1 changed to solution
Passo 34
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 5 in C6 changed to solution
Last candidate 5 in G4 changed to solution
Last candidate 6 in H5 changed to solution
Last candidate 7 in H9 changed to solution
Passo 35
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 6 in C4 changed to solution
Last candidate 2 in G6 changed to solution
Last candidate 4 in H3 changed to solution
Last candidate 4 in J4 changed to solution
Last candidate 6 in J9 changed to solution
Passo 36
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 7 in J3 changed to solution