Passi risolutivi (28)
Passo 1
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 7 in F9 changed to solution
Passo 2
Naked Singles
valore: 2.7
categoria doc: Getting_Started
Last candidate 8 in F8 changed to solution
Passo 3
Naked Singles
valore: 2.6
categoria doc: Getting_Started
Last candidate 9 in E8 changed to solution
Last candidate 2 in F3 changed to solution
Passo 4
Naked Singles
valore: 2.4
categoria doc: Getting_Started
Last candidate 4 in D7 changed to solution
Last candidate 3 in F4 changed to solution
Passo 5
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 7 in D5 changed to solution
Last candidate 8 in D6 changed to solution
Last candidate 5 in E9 changed to solution
Last candidate 1 in F5 changed to solution
Passo 6
Hidden Singles
valore: 3.4
categoria doc: Getting_Started
1 in G6 is last in column/box
1 in J1 is last in row
5 in C5 is last in row/box
5 in G3 is last in column/box
5 in H6 is last in row
6 in E4 is last in column/box
8 in C4 is last in column/box
Passo 7
Hidden Singles
valore: 2.8
categoria doc: Getting_Started
3 in A6 is last in column
3 in G5 is last in box
4 in C3 is last in row
9 in A5 is last in column/box
Passo 8
Hidden Singles
valore: 2.4
categoria doc: Getting_Started
4 in G9 is last in row
Passo 9
Hidden Singles
valore: 2.3
categoria doc: Getting_Started
6 in G8 is last in row/box
Passo 10
Naked Pair
valore: 11.3
categoria doc: Naked_Candidates
Naked Pair 2/4 on cells {B4|B6} means
- 2 can be removed from B2
Passo 11
Pointing Pairs
valore: 33
categoria doc: Intersection_Removal
Pair: between Box 3 and Row C:
- 9 can be removed from C1
- 9 can be removed from C2
Passo 12
Hidden Singles
valore: 2.2
categoria doc: Getting_Started
9 in D1 is last in column
Passo 13
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 6 in D2 changed to solution
Passo 14
W-Wing
valore: 50.9
categoria doc: W_Wings
W-Wing (single). Either there is a 2 in A7 or in H4. They are connected through 7 in B8/H8, therefore
- 2 can be removed from H7
Passo 15
XY-Chain
valore: 130.5
categoria doc: XY_Chains
length=4, chain ends: C2 and H4
This proves 2 is the solution at one or possibly both ends of the chain
-2[C2]+1[C2]-1[C8]+3[C8]-3[H8]+7[H8]-7[H4]+2[H4]
- 2 can be removed from H2
Passo 16
Hidden Singles
valore: 2
categoria doc: Getting_Started
2 in H4 is last in row
Passo 17
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 4 in B4 changed to solution
Last candidate 4 in J5 changed to solution
Passo 18
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 2 in B6 changed to solution
Last candidate 2 in E5 changed to solution
Last candidate 7 in J4 changed to solution
Passo 19
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 4 in E6 changed to solution
Passo 20
Pointing Pairs
valore: 22.7
categoria doc: Intersection_Removal
Pair: between Box 7 and Row G:
- 2 can be removed from G7
Passo 21
Line/Box Reduction
valore: 29.2
categoria doc: Intersection_Removal
Pair: between Col 3 and Box 1:
- 7 can be removed from A1
- 7 can be removed from B2
Passo 22
Y-Wing
valore: 57.2
categoria doc: Y_Wing_Strategy
Y-Wing pattern. Hinge: B2 (1/9), wings B8 H2, therefore
- 7 can be removed from H8
Last candidate 3 in H8 changed to solution
Passo 23
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 1 in C8 changed to solution
Passo 24
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 7 in B8 changed to solution
Last candidate 2 in C2 changed to solution
Passo 25
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 2 in A7 changed to solution
Last candidate 9 in B3 changed to solution
Last candidate 6 in C1 changed to solution
Passo 26
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 8 in A1 changed to solution
Last candidate 6 in A9 changed to solution
Last candidate 1 in B2 changed to solution
Last candidate 9 in C9 changed to solution
Last candidate 8 in J3 changed to solution
Passo 27
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 7 in A3 changed to solution
Last candidate 3 in C7 changed to solution
Last candidate 7 in E1 changed to solution
Last candidate 7 in G2 changed to solution
Last candidate 9 in J7 changed to solution
Last candidate 2 in J9 changed to solution
Passo 28
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 8 in E2 changed to solution
Last candidate 2 in G1 changed to solution
Last candidate 8 in G7 changed to solution
Last candidate 9 in H2 changed to solution
Last candidate 7 in H7 changed to solution