Passi risolutivi (33)
Passo 1
Hidden Singles
valore: 6
categoria doc: Getting_Started
1 in A7 is last in column/box
1 in H1 is last in row
4 in B9 is last in row
4 in G3 is last in column/box
Passo 2
Hidden Singles
valore: 5.5
categoria doc: Getting_Started
1 in B3 is last in row/column/box
3 in H2 is last in row
4 in H7 is last in row/column/box
Passo 3
Naked Singles
valore: 2.5
categoria doc: Getting_Started
Last candidate 8 in B2 changed to solution
Passo 4
Pointing Pairs
valore: 75.1
categoria doc: Intersection_Removal
Triple: between Box 7 and Row J:
- 2 can be removed from J7
- 2 can be removed from J9
Passo 5
Pointing Pairs
valore: 74.3
categoria doc: Intersection_Removal
Pair: between Box 2 and Col 6:
- 6 can be removed from E6
- 6 can be removed from F6
Passo 6
Line/Unit Reduction
valore: 95.7
categoria doc: Intersection_Removal
Line/Box Reduction: 8s in box 5 remove the following in the same box:
- 8 can be removed from D4
- 8 can be removed from D6
- 8 can be removed from E4
- 8 can be removed from E6
- 8 can be removed from F4
- 8 can be removed from F6
Passo 7
Hidden Pair
valore: 46.5
categoria doc: Hidden_Candidates
Hidden Pair 6/8 in Row E, on cells {E5|E8}
- removes 5/9 from E5
- removes 2/5/9 from E8
Passo 8
Pointing Pairs
valore: 68.5
categoria doc: Intersection_Removal
Pair: between Box 6 and Row F:
- 9 can be removed from F4
- 9 can be removed from F5
- 9 can be removed from F6
Passo 9
Hidden Singles
valore: 4.5
categoria doc: Getting_Started
9 in H5 is last in column
Passo 10
Naked Pair
valore: 21.2
categoria doc: Naked_Candidates
Naked Pair 2/5 on cells {H8|H9} means
- 5 can be removed from G7
- 5 can be removed from G8
- 5 can be removed from J7
- 5 can be removed from J9
Passo 11
Hidden Singles
valore: 4.2
categoria doc: Getting_Started
5 in D7 is last in column
Passo 12
Naked Singles
valore: 1.9
categoria doc: Getting_Started
Last candidate 8 in D5 changed to solution
Passo 13
Naked Singles
valore: 1.8
categoria doc: Getting_Started
Last candidate 2 in D9 changed to solution
Last candidate 6 in E5 changed to solution
Passo 14
Naked Singles
valore: 1.6
categoria doc: Getting_Started
Last candidate 8 in E8 changed to solution
Last candidate 5 in F5 changed to solution
Last candidate 5 in H9 changed to solution
Passo 15
Naked Singles
valore: 1.6
categoria doc: Getting_Started
Last candidate 2 in H8 changed to solution
Passo 16
Hidden Singles
valore: 3
categoria doc: Getting_Started
2 in C7 is last in column/box
5 in A8 is last in row/column/box
8 in F1 is last in row/column/box
Passo 17
Naked Pair
valore: 13.8
categoria doc: Naked_Candidates
Naked Pair 6/8 on cells {G7|J7} means
- 6 can be removed from G8
- 6/8 can be removed from J9
Passo 18
Naked Triple
valore: 52.3
categoria doc: Naked_Candidates
Naked Triple 1/3/8 on cells {D6|G6|J6} means
- 8 can be removed from A6
- 8 can be removed from C6
- 3 can be removed from E6
- 8 can be removed from G4
- 8 can be removed from J4
Passo 19
W-Wing
valore: 64.6
categoria doc: W_Wings
W-Wing (single). Either there is a 9 in C2 or in J9. They are connected through 7 in C8/G8, therefore
- 9 can be removed from J2
Passo 20
XY-Chain
valore: 243.1
categoria doc: XY_Chains
length=7, chain ends: E2 and J4
This proves 5 is the solution at one or possibly both ends of the chain
-5[E2]+2[E2]-2[F3]+7[F3]-7[D1]+3[D1]-3[D6]+1[D6]-1[G6]+8[G6]-8[J6]+3[J6]-3[J4]+5[J4]
- 5 can be removed from J2
Passo 21
3D Medusa
valore: 200.3
categoria doc: 3D_Medusa
(RULE 5): Uncoloured candidate 7 in G1 can see coloured 7 elsewhere and an oppositely coloured 6 in its own cell. It can be removed.
(RULE 5): Uncoloured candidate 7 in J3 can see coloured 7 elsewhere and an oppositely coloured 5 in its own cell. It can be removed.
Passo 22
W-Wing
valore: 61.9
categoria doc: W_Wings
W-Wing (single). Either there is a 9 in F8 or in G1. They are connected through 6 in B8/B1, therefore
- 9 can be removed from G8
Last candidate 7 in G8 changed to solution
Passo 23
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 9 in J9 changed to solution
Passo 24
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 6 in F9 changed to solution
Passo 25
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 9 in F8 changed to solution
Passo 26
XY-Chain
valore: 135.9
categoria doc: XY_Chains
length=4, chain ends: F3 and C2
This proves 7 is the solution at one or possibly both ends of the chain
-7[F3]+2[F3]-2[E2]+5[E2]-5[G2]+9[G2]-9[C2]+7[C2]
- 7 can be removed from A3
- 7 can be removed from C3
Passo 27
Hidden Singles
valore: 2.1
categoria doc: Getting_Started
7 in F3 is last in column
Passo 28
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 3 in D1 changed to solution
Last candidate 4 in F4 changed to solution
Passo 29
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 6 in B1 changed to solution
Last candidate 1 in D6 changed to solution
Last candidate 2 in F6 changed to solution
Passo 30
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 2 in A3 changed to solution
Last candidate 3 in B8 changed to solution
Last candidate 3 in C3 changed to solution
Last candidate 7 in D4 changed to solution
Last candidate 9 in E6 changed to solution
Last candidate 9 in G1 changed to solution
Last candidate 8 in G6 changed to solution
Passo 31
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 7 in A1 changed to solution
Last candidate 6 in A6 changed to solution
Last candidate 6 in C8 changed to solution
Last candidate 5 in E3 changed to solution
Last candidate 3 in E4 changed to solution
Last candidate 5 in G2 changed to solution
Last candidate 6 in G7 changed to solution
Last candidate 3 in J6 changed to solution
Passo 32
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 8 in A9 changed to solution
Last candidate 9 in C2 changed to solution
Last candidate 4 in C6 changed to solution
Last candidate 2 in E2 changed to solution
Last candidate 1 in G4 changed to solution
Last candidate 2 in J1 changed to solution
Last candidate 6 in J3 changed to solution
Last candidate 5 in J4 changed to solution
Last candidate 8 in J7 changed to solution
Passo 33
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 9 in A4 changed to solution
Last candidate 8 in C4 changed to solution
Last candidate 7 in C9 changed to solution
Last candidate 7 in J2 changed to solution