Passi risolutivi (25)
Passo 1
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 9 in E5 changed to solution
Passo 2
Hidden Singles
valore: 4.9
categoria doc: Getting_Started
2 in D6 is last in column/box
2 in H8 is last in row/box
3 in C4 is last in row
3 in J1 is last in column/box
5 in G2 is last in row/box
6 in G5 is last in column
9 in F2 is last in column/box
9 in J6 is last in row/box
Passo 3
Naked Singles
valore: 2.1
categoria doc: Getting_Started
Last candidate 4 in E8 changed to solution
Passo 4
Naked Singles
valore: 2
categoria doc: Getting_Started
Last candidate 2 in E2 changed to solution
Passo 5
Hidden Singles
valore: 3.4
categoria doc: Getting_Started
2 in C3 is last in row/column/box
2 in F7 is last in row/column/box
4 in A2 is last in column
4 in F3 is last in row/box
4 in G6 is last in column/box
4 in J9 is last in row
6 in J8 is last in column/box
9 in A4 is last in column/box
9 in C8 is last in row
Passo 6
Hidden Singles
valore: 2.8
categoria doc: Getting_Started
1 in C2 is last in row
6 in B4 is last in column/box
9 in D7 is last in row/column/box
Passo 7
Hidden Singles
valore: 2.5
categoria doc: Getting_Started
6 in H2 is last in column
Passo 8
Hidden Singles
valore: 2.4
categoria doc: Getting_Started
7 in J2 is last in box
Passo 9
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 8 in B2 changed to solution
Passo 10
Naked Pair
valore: 10.6
categoria doc: Naked_Candidates
Naked Pair 1/8 on cells {H3|J3} means
- 8 can be removed from D3
Passo 11
Pointing Pairs
valore: 31.4
categoria doc: Intersection_Removal
Pair: between Box 8 and Col 4:
- 1 can be removed from F4
Passo 12
Pointing Pairs
valore: 30.9
categoria doc: Intersection_Removal
Triple: between Box 9 and Row G:
- 7 can be removed from G4
Passo 13
Y-Wing
valore: 81.4
categoria doc: Y_Wing_Strategy
Y-Wing pattern. Hinge: C1 (5/7), wings C5 F1, therefore
- 8 can be removed from F5
Passo 14
Rectangle Elimination
valore: 50.2
categoria doc: Rectangle_Elimination
If +5[A9] then -5[A3] forcing +5[D3] which removes all 5s from box 6, so A9 cannot be 5
Passo 15
Pointing Pairs
valore: 29.7
categoria doc: Intersection_Removal
Pair: between Box 3 and Col 8:
- 5 can be removed from D8
Passo 16
XY-Chain
valore: 146.5
categoria doc: XY_Chains
length=5, chain ends: B7 and H6
This proves 7 is the solution at one or possibly both ends of the chain
-7[B7]+1[B7]-1[J7]+8[J7]-8[J3]+1[J3]-1[H3]+8[H3]-8[H6]+7[H6]
- 7 can be removed from B6
Last candidate 5 in B6 changed to solution
Passo 17
Hidden Singles
valore: 1.8
categoria doc: Getting_Started
5 in A8 is last in column/box
5 in C1 is last in row
Passo 18
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 6 in A3 changed to solution
Last candidate 8 in F1 changed to solution
Passo 19
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 7 in A1 changed to solution
Last candidate 6 in D1 changed to solution
Last candidate 5 in D3 changed to solution
Last candidate 7 in F4 changed to solution
Passo 20
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 3 in A9 changed to solution
Last candidate 1 in F5 changed to solution
Passo 21
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 8 in A7 changed to solution
Last candidate 8 in D5 changed to solution
Last candidate 5 in F9 changed to solution
Passo 22
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 7 in C5 changed to solution
Last candidate 1 in J7 changed to solution
Passo 23
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 7 in B7 changed to solution
Last candidate 8 in C6 changed to solution
Last candidate 7 in G9 changed to solution
Last candidate 8 in J3 changed to solution
Passo 24
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 1 in B8 changed to solution
Last candidate 1 in D9 changed to solution
Last candidate 3 in G7 changed to solution
Last candidate 8 in G8 changed to solution
Last candidate 1 in H3 changed to solution
Last candidate 7 in H6 changed to solution
Passo 25
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 7 in D8 changed to solution
Last candidate 1 in G4 changed to solution
Last candidate 8 in H4 changed to solution