Passi risolutivi (32)
Passo 1
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 6 in A8 changed to solution
Passo 2
Hidden Singles
valore: 5.1
categoria doc: Getting_Started
2 in J8 is last in column/box
3 in A6 is last in row/box
3 in D8 is last in column/box
3 in G5 is last in column
4 in A7 is last in column
4 in F9 is last in row/box
7 in D4 is last in row/box
Passo 3
Hidden Singles
valore: 4.5
categoria doc: Getting_Started
7 in A2 is last in row
Passo 4
Hidden Singles
valore: 4.3
categoria doc: Getting_Started
7 in H1 is last in column/box
Passo 5
Hidden Singles
valore: 4.2
categoria doc: Getting_Started
4 in J1 is last in column/box
Passo 6
Hidden Singles
valore: 4
categoria doc: Getting_Started
3 in E1 is last in column
3 in J2 is last in row/box
Passo 7
Naked Pair
valore: 19.3
categoria doc: Naked_Candidates
Naked Pair 5/6 on cells {J6|J7} means
- 5/6 can be removed from J4
Passo 8
Pointing Pairs
valore: 57.4
categoria doc: Intersection_Removal
Pair: between Box 1 and Col 3:
- 5 can be removed from E3
Passo 9
Pointing Pairs
valore: 56.1
categoria doc: Intersection_Removal
Pair: between Box 3 and Row C:
- 8 can be removed from C4
- 8 can be removed from C5
- 8 can be removed from C6
Passo 10
Pointing Pairs
valore: 55.3
categoria doc: Intersection_Removal
Pair: between Box 7 and Row G:
- 8 can be removed from G4
- 8 can be removed from G6
Passo 11
Line/Unit Reduction
valore: 72.6
categoria doc: Intersection_Removal
Line/Box Reduction: 1s in box 1 remove the following in the same box:
- 1 can be removed from B2
- 1 can be removed from C3
Last candidate 6 in B2 changed to solution
Passo 12
X-Wing
valore: 97.4
categoria doc: X_Wing_Strategy
(Col->Row) 9 taken off C3, based on AJ34
(Col->Row) 9 taken off G3, based on AJ34
(Col->Row) 9 taken off C4, based on AJ34
(Col->Row) 9 taken off G4, based on AJ34
(Col->Row) 9 taken off H4, based on AJ34
Passo 13
Rectangle Elimination
valore: 80.5
categoria doc: Rectangle_Elimination
If +9[F2] then -9[G2] forcing +9[G9] which removes all 9s from Box 6, so F2 cannot be 9
Passo 14
3D Medusa
valore: 255.3
categoria doc: 3D_Medusa
(RULE 5): Uncoloured candidate 2 in C5 can see coloured 2 elsewhere and an oppositely coloured 9 in its own cell. It can be removed.
Passo 15
3D Medusa
valore: 248.7
categoria doc: 3D_Medusa
(RULE 5): Uncoloured candidate 2 in F1 can see coloured 2 elsewhere and an oppositely coloured 9 in its own cell. It can be removed.
(RULE 5): Uncoloured candidate 9 in C1 can see coloured 9 elsewhere and an oppositely coloured 1 in its own cell. It can be removed.
(RULE 5): Uncoloured candidate 9 in G9 can see coloured 9 elsewhere and an oppositely coloured 7 in its own cell. It can be removed.
Passo 16
Hidden Singles
valore: 2.9
categoria doc: Getting_Started
2 in E3 is last in box
9 in A3 is last in box
9 in C5 is last in row
9 in G2 is last in row
Passo 17
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 5 in A4 changed to solution
Last candidate 5 in C3 changed to solution
Last candidate 1 in J3 changed to solution
Passo 18
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 8 in G3 changed to solution
Last candidate 9 in J4 changed to solution
Passo 19
Hidden Singles
valore: 2.3
categoria doc: Getting_Started
1 in E2 is last in row/column/box
Passo 20
Line/Unit Reduction
valore: 45.1
categoria doc: Intersection_Removal
Line/Box Reduction: 6s in box 5 remove the following in the same box:
- 6 can be removed from F6
Passo 21
XY-Chain
valore: 187.1
categoria doc: XY_Chains
length=6, chain ends: B1 and C8
This proves 1 is the solution at one or possibly both ends of the chain
-1[B1]+2[B1]-2[B4]+8[B4]-8[H4]+1[H4]-1[H8]+9[H8]-9[F8]+8[F8]-8[C8]+1[C8]
- 1 can be removed from B9
- 1 can be removed from C1
Last candidate 7 in B9 changed to solution
Last candidate 2 in C1 changed to solution
Passo 22
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 1 in B1 changed to solution
Last candidate 6 in C4 changed to solution
Last candidate 8 in C7 changed to solution
Passo 23
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 7 in C6 changed to solution
Last candidate 1 in C8 changed to solution
Passo 24
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 9 in H8 changed to solution
Passo 25
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 8 in F8 changed to solution
Passo 26
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 5 in F2 changed to solution
Passo 27
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 8 in D2 changed to solution
Last candidate 2 in F6 changed to solution
Passo 28
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 6 in F5 changed to solution
Last candidate 6 in G6 changed to solution
Passo 29
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 5 in D5 changed to solution
Last candidate 9 in F1 changed to solution
Last candidate 7 in G7 changed to solution
Last candidate 1 in G9 changed to solution
Last candidate 5 in J6 changed to solution
Passo 30
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 6 in D1 changed to solution
Last candidate 8 in E5 changed to solution
Last candidate 2 in G4 changed to solution
Last candidate 5 in H9 changed to solution
Last candidate 6 in J7 changed to solution
Passo 31
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 8 in B4 changed to solution
Last candidate 9 in D9 changed to solution
Last candidate 5 in E7 changed to solution
Last candidate 6 in E9 changed to solution
Last candidate 4 in H5 changed to solution
Passo 32
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 2 in B5 changed to solution
Last candidate 4 in B6 changed to solution
Last candidate 1 in H4 changed to solution
Last candidate 8 in H6 changed to solution