Passi risolutivi (34)
Passo 1
Hidden Singles
valore: 5.5
categoria doc: Getting_Started
5 in G6 is last in box
5 in J8 is last in row
8 in A5 is last in row
9 in A8 is last in row
Passo 2
Hidden Singles
valore: 5
categoria doc: Getting_Started
9 in E7 is last in column/box
Passo 3
Hidden Singles
valore: 4.9
categoria doc: Getting_Started
3 in D9 is last in box
Passo 4
Naked Pair
valore: 22.7
categoria doc: Naked_Candidates
Naked Pair 1/7 on cells {B4|C4} means
- 7 can be removed from B5
- 1 can be removed from B6
- 1 can be removed from D4
- 1/7 can be removed from E4
- 1/7 can be removed from F4
Passo 5
Hidden Singles
valore: 4.5
categoria doc: Getting_Started
7 in F5 is last in row
Passo 6
Hidden Singles
valore: 4.3
categoria doc: Getting_Started
4 in B5 is last in column
4 in F6 is last in row/box
Passo 7
Naked Singles
valore: 2
categoria doc: Getting_Started
Last candidate 6 in B6 changed to solution
Passo 8
Naked Singles
valore: 1.9
categoria doc: Getting_Started
Last candidate 1 in D6 changed to solution
Passo 9
Hidden Singles
valore: 3.7
categoria doc: Getting_Started
1 in E8 is last in row
1 in F1 is last in column/box
Passo 10
Hidden Singles
valore: 3.5
categoria doc: Getting_Started
2 in F4 is last in row
Passo 11
Hidden Pair
valore: 33.6
categoria doc: Hidden_Candidates
Hidden Pair 8/9 in Box 1, on cells {B1|B2}
- removes 2/5 from B1
- removes 2 from B2
Passo 12
Hidden Singles
valore: 3.3
categoria doc: Getting_Started
5 in D1 is last in column
Passo 13
Naked Singles
valore: 1.6
categoria doc: Getting_Started
Last candidate 9 in D4 changed to solution
Passo 14
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 6 in D5 changed to solution
Last candidate 8 in H4 changed to solution
Passo 15
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 2 in D2 changed to solution
Last candidate 5 in E4 changed to solution
Last candidate 3 in E5 changed to solution
Last candidate 3 in H6 changed to solution
Passo 16
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 8 in E6 changed to solution
Last candidate 2 in J5 changed to solution
Passo 17
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 9 in H5 changed to solution
Passo 18
Pointing Pairs
valore: 34.7
categoria doc: Intersection_Removal
Pair: between Box 3 and Col 9:
- 4 can be removed from H9
Passo 19
Pointing Pairs
valore: 33.8
categoria doc: Intersection_Removal
Pair: between Box 9 and Row G:
- 8 can be removed from G1
- 8 can be removed from G2
Passo 20
Y-Wing
valore: 88
categoria doc: Y_Wing_Strategy
Y-Wing pattern. Hinge: B7 (1/2), wings B4 C8, therefore
- 7 can be removed from B9
- 7 can be removed from C4
Last candidate 1 in C4 changed to solution
Passo 21
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 7 in B4 changed to solution
Passo 22
3D Medusa
valore: 165.1
categoria doc: 3D_Medusa
(RULE 5): Uncoloured candidate 2 in G1 can see coloured 2 elsewhere and an oppositely coloured 9 in its own cell. It can be removed.
Passo 23
Rectangle Elimination
valore: 50.9
categoria doc: Rectangle_Elimination
If +2[H7] then -2[B7] forcing +2[B3] which removes all 2s from Box 7, so H7 cannot be 2
Passo 24
XY-Chain
valore: 130.5
categoria doc: XY_Chains
length=4, chain ends: A3 and H7
This proves 4 is the solution at one or possibly both ends of the chain
-4[A3]+5[A3]-5[B3]+2[B3]-2[B7]+1[B7]-1[H7]+4[H7]
- 4 can be removed from H3
Passo 25
Hidden Singles
valore: 2
categoria doc: Getting_Started
4 in H7 is last in row
4 in J2 is last in box
Passo 26
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 6 in C2 changed to solution
Last candidate 3 in J7 changed to solution
Passo 27
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 7 in E2 changed to solution
Last candidate 2 in G7 changed to solution
Last candidate 8 in J1 changed to solution
Passo 28
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 9 in B1 changed to solution
Last candidate 1 in B7 changed to solution
Last candidate 6 in E3 changed to solution
Last candidate 9 in G2 changed to solution
Passo 29
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 8 in B2 changed to solution
Last candidate 5 in B9 changed to solution
Passo 30
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 4 in A9 changed to solution
Last candidate 2 in B3 changed to solution
Passo 31
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 5 in A3 changed to solution
Last candidate 3 in C1 changed to solution
Last candidate 7 in C9 changed to solution
Last candidate 7 in H3 changed to solution
Passo 32
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 4 in C3 changed to solution
Last candidate 2 in C8 changed to solution
Last candidate 6 in G1 changed to solution
Last candidate 3 in G3 changed to solution
Last candidate 6 in H8 changed to solution
Passo 33
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 8 in F8 changed to solution
Last candidate 8 in G9 changed to solution
Last candidate 2 in H1 changed to solution
Last candidate 1 in H9 changed to solution
Passo 34
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 6 in F9 changed to solution
Last candidate 7 in G8 changed to solution