Passi risolutivi (28)
Passo 1
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 5 in B8 changed to solution
Passo 2
Hidden Singles
valore: 5.9
categoria doc: Getting_Started
3 in G8 is last in column/box
4 in A5 is last in column/box
9 in H7 is last in row/box
Passo 3
Hidden Singles
valore: 5.6
categoria doc: Getting_Started
4 in H2 is last in row
Passo 4
Hidden Singles
valore: 5.4
categoria doc: Getting_Started
3 in A2 is last in column
Passo 5
Hidden Singles
valore: 5.3
categoria doc: Getting_Started
3 in H6 is last in column
Passo 6
Hidden Singles
valore: 5
categoria doc: Getting_Started
3 in J1 is last in row/column/box
Passo 7
Hidden Pair
valore: 48.7
categoria doc: Hidden_Candidates
Hidden Pair 1/4 in Box 3, on cells {C7|C8}
- removes 2/6/7 from C7
- removes 2 from C8
Passo 8
Pointing Pairs
valore: 72.2
categoria doc: Intersection_Removal
Pair: between Box 3 and Row A:
- 2 can be removed from A1
- 2 can be removed from A3
Passo 9
Line/Unit Reduction
valore: 95.2
categoria doc: Intersection_Removal
Line/Box Reduction: 2s in box 6 remove the following in the same box:
- 2 can be removed from E9
- 2 can be removed from F9
Passo 10
Line/Unit Reduction
valore: 93
categoria doc: Intersection_Removal
Line/Box Reduction: 5s in box 7 remove the following in the same box:
- 5 can be removed from G1
- 5 can be removed from G2
- 5 can be removed from G3
- 5 can be removed from J3
Passo 11
Hidden Singles
valore: 4.6
categoria doc: Getting_Started
5 in E2 is last in column
Passo 12
Naked Pair
valore: 20.8
categoria doc: Naked_Candidates
Naked Pair 1/9 on cells {F1|F3} means
- 1/9 can be removed from D1
- 1/9 can be removed from E1
- 9 can be removed from F4
- 1 can be removed from F5
- 1 can be removed from F8
- 9 can be removed from F9
Passo 13
Naked Pair
valore: 19.8
categoria doc: Naked_Candidates
Naked Pair 7/8 on cells {D1|E1} means
- 7/8 can be removed from A1
- 7/8 can be removed from C1
- 7/8 can be removed from G1
- 8 can be removed from H1
Passo 14
Rectangle Elimination
valore: 98.3
categoria doc: Rectangle_Elimination
If +5[G9] then -5[F9] forcing +5[F4] which removes all 5s from Box 8, so G9 cannot be 5
Passo 15
XY-Chain
valore: 252.1
categoria doc: XY_Chains
length=4, chain ends: A6 and H5
This proves 8 is the solution at one or possibly both ends of the chain
-8[A6]+6[A6]-6[A1]+5[A1]-5[H1]+2[H1]-2[H5]+8[H5]
- 8 can be removed from B5
- 8 can be removed from G6
Passo 16
3D Medusa
valore: 305.9
categoria doc: 3D_Medusa
(RULE 4): Uncoloured candidate 1 in D5 can see two different coloured candidates of 1 elsewhere.
(RULE 4): Uncoloured candidate 1 in E6 can see two different coloured candidates of 1 elsewhere.
Last candidate 8 in D5 changed to solution
Passo 17
Naked Singles
valore: 1.7
categoria doc: Getting_Started
Last candidate 7 in D1 changed to solution
Last candidate 2 in H5 changed to solution
Passo 18
Naked Singles
valore: 1.6
categoria doc: Getting_Started
Last candidate 8 in E1 changed to solution
Last candidate 3 in F5 changed to solution
Last candidate 5 in H1 changed to solution
Passo 19
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 6 in A1 changed to solution
Last candidate 8 in H3 changed to solution
Passo 20
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 8 in A6 changed to solution
Last candidate 7 in G2 changed to solution
Passo 21
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 8 in C2 changed to solution
Passo 22
Hidden Singles
valore: 2.2
categoria doc: Getting_Started
3 in B4 is last in row/column/box
5 in A3 is last in row/column/box
6 in C6 is last in row
7 in E9 is last in row/box
8 in B9 is last in row/column/box
8 in G4 is last in row/column/box
Passo 23
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 2 in A9 changed to solution
Last candidate 7 in B5 changed to solution
Last candidate 9 in E6 changed to solution
Passo 24
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 7 in A7 changed to solution
Last candidate 9 in B3 changed to solution
Last candidate 6 in B7 changed to solution
Last candidate 9 in C4 changed to solution
Last candidate 2 in E4 changed to solution
Last candidate 1 in J5 changed to solution
Passo 25
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 2 in C1 changed to solution
Last candidate 6 in E5 changed to solution
Last candidate 1 in E8 changed to solution
Last candidate 1 in F3 changed to solution
Last candidate 5 in F4 changed to solution
Last candidate 5 in G6 changed to solution
Passo 26
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 7 in C3 changed to solution
Last candidate 4 in C8 changed to solution
Last candidate 1 in D6 changed to solution
Last candidate 5 in D7 changed to solution
Last candidate 9 in F1 changed to solution
Last candidate 4 in F9 changed to solution
Last candidate 1 in G1 changed to solution
Last candidate 7 in J4 changed to solution
Passo 27
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 1 in C7 changed to solution
Last candidate 9 in D9 changed to solution
Last candidate 2 in F8 changed to solution
Last candidate 6 in G9 changed to solution
Last candidate 2 in J7 changed to solution
Passo 28
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 2 in G3 changed to solution
Last candidate 4 in G7 changed to solution
Last candidate 6 in J3 changed to solution
Last candidate 5 in J9 changed to solution