Passi risolutivi (26)
Passo 1
Hidden Singles
valore: 5.4
categoria doc: Getting_Started
6 in A8 is last in row
6 in B3 is last in box
8 in D9 is last in row/column/box
Passo 2
Naked Singles
valore: 2.6
categoria doc: Getting_Started
Last candidate 2 in E3 changed to solution
Passo 3
Naked Pair
valore: 23.9
categoria doc: Naked_Candidates
Naked Pair 1/9 on cells {E2|E8} means
- 1/9 can be removed from E5
- 1 can be removed from E7
Passo 4
Hidden Pair
valore: 46.5
categoria doc: Hidden_Candidates
Hidden Pair 1/9 in Box 2, on cells {C4|C5}
- removes 4/7 from C4
- removes 4/7/8 from C5
Passo 5
Hidden Singles
valore: 4.6
categoria doc: Getting_Started
8 in C3 is last in row
Passo 6
Hidden Singles
valore: 4.3
categoria doc: Getting_Started
3 in G3 is last in column
8 in G2 is last in column/box
8 in H6 is last in row
Passo 7
Hidden Singles
valore: 3.9
categoria doc: Getting_Started
3 in J8 is last in row/box
8 in A5 is last in row/column/box
Passo 8
Pointing Pairs
valore: 55.7
categoria doc: Intersection_Removal
Pair: between Box 2 and Col 3:
- 5 can be removed from H4
- 5 can be removed from J4
Passo 9
Pointing Pairs
valore: 55.3
categoria doc: Intersection_Removal
Pair: between Box 2 and Row B:
- 7 can be removed from B7
Passo 10
Line/Box Reduction
valore: 72.6
categoria doc: Intersection_Removal
Pair: between Row D and Box 2:
- 4 can be removed from A9
- 4 can be removed from B7
Last candidate 5 in B7 changed to solution
Passo 11
Hidden Singles
valore: 3.4
categoria doc: Getting_Started
5 in A4 is last in row/column/box
Passo 12
Rectangle Elimination
valore: 84.6
categoria doc: Rectangle_Elimination
If +5[G1] then -5[D1] forcing +5[D8] which removes all 5s from box 9, so G1 cannot be 5
Passo 13
Rectangle Elimination
valore: 83.9
categoria doc: Rectangle_Elimination
If +5[H8] then -5[D8] forcing +5[D1] which removes all 5s from box 7, so H8 cannot be 5
Passo 14
Hidden Singles
valore: 3.3
categoria doc: Getting_Started
5 in G9 is last in box
5 in H3 is last in row
Passo 15
Naked Singles
valore: 1.6
categoria doc: Getting_Started
Last candidate 7 in F3 changed to solution
Passo 16
Hidden Singles
valore: 2.9
categoria doc: Getting_Started
5 in J5 is last in row/column/box
7 in J2 is last in column/box
Passo 17
Hidden Singles
valore: 2.7
categoria doc: Getting_Started
2 in A2 is last in column
Passo 18
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 3 in A9 changed to solution
Last candidate 3 in C1 changed to solution
Passo 19
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 4 in A6 changed to solution
Last candidate 4 in B2 changed to solution
Passo 20
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 7 in B4 changed to solution
Last candidate 1 in J6 changed to solution
Passo 21
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 3 in B6 changed to solution
Last candidate 9 in F6 changed to solution
Last candidate 2 in H4 changed to solution
Last candidate 2 in J1 changed to solution
Passo 22
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 1 in D4 changed to solution
Last candidate 1 in F2 changed to solution
Last candidate 1 in G1 changed to solution
Last candidate 7 in G6 changed to solution
Last candidate 4 in J4 changed to solution
Passo 23
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 9 in C4 changed to solution
Last candidate 6 in D7 changed to solution
Last candidate 9 in E2 changed to solution
Last candidate 9 in G5 changed to solution
Last candidate 2 in G7 changed to solution
Passo 24
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 1 in C5 changed to solution
Last candidate 5 in D1 changed to solution
Last candidate 3 in D2 changed to solution
Last candidate 7 in D5 changed to solution
Last candidate 4 in E7 changed to solution
Last candidate 1 in E8 changed to solution
Passo 25
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 7 in C7 changed to solution
Last candidate 9 in D8 changed to solution
Last candidate 6 in E5 changed to solution
Last candidate 6 in F1 changed to solution
Last candidate 2 in F9 changed to solution
Last candidate 7 in H8 changed to solution
Passo 26
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 2 in C8 changed to solution
Last candidate 4 in C9 changed to solution
Last candidate 4 in F5 changed to solution
Last candidate 5 in F8 changed to solution
Last candidate 1 in H7 changed to solution