Passi risolutivi (14)
Passo 1
Hidden Singles
valore: 4.9
categoria doc: Getting_Started
2 in B2 is last in row/box
3 in A6 is last in row/column/box
3 in E9 is last in column
3 in G7 is last in row/box
4 in A7 is last in row/box
4 in D5 is last in row
4 in E1 is last in column/box
4 in J8 is last in column
5 in B1 is last in box
Passo 2
Hidden Singles
valore: 3.9
categoria doc: Getting_Started
3 in F2 is last in row/column/box
4 in G4 is last in row/column/box
5 in H9 is last in box
6 in A9 is last in row
6 in B5 is last in box
6 in E6 is last in column
6 in G3 is last in row
Passo 3
Naked Singles
valore: 1.6
categoria doc: Getting_Started
Last candidate 9 in B4 changed to solution
Passo 4
Hidden Singles
valore: 2.7
categoria doc: Getting_Started
2 in E4 is last in box
2 in J6 is last in column
5 in C4 is last in column
5 in G5 is last in row/box
6 in F8 is last in column
6 in J7 is last in row/box
7 in A4 is last in row
9 in H5 is last in column/box
Passo 5
Hidden Singles
valore: 1.9
categoria doc: Getting_Started
1 in C5 is last in column
2 in D8 is last in column/box
2 in F3 is last in row
8 in C6 is last in column
8 in H1 is last in row/box
Passo 6
Rectangle Elimination
valore: 42
categoria doc: Rectangle_Elimination
If +1[D2] then -1[D9] forcing +1[J9] which removes all 1s from box 7, so D2 cannot be 1
Passo 7
Rectangle Elimination
valore: 41.3
categoria doc: Rectangle_Elimination
If +7[D2] then -7[D9] forcing +7[J9] which removes all 7s from box 7, so D2 cannot be 7
Last candidate 8 in D2 changed to solution
Passo 8
Hidden Singles
valore: 1.4
categoria doc: Getting_Started
8 in A3 is last in row/column/box
Passo 9
Line/Unit Reduction
valore: 26.4
categoria doc: Intersection_Removal
Line/Box Reduction: 7s in box 6 remove the following in the same box:
- 7 can be removed from E7
- 7 can be removed from E8
- 7 can be removed from F7
Passo 10
XYZ Wing
valore: 77.6
categoria doc: XYZ_Wing
XYZ-Wing pattern. Hinge: E2 (1/7/9), wings E8 F1, therefore
- 9 can be removed from E3
Passo 11
Hidden Singles
valore: 1.3
categoria doc: Getting_Started
9 in J3 is last in column
Passo 12
Naked Pair
valore: 5.9
categoria doc: Naked_Candidates
Naked Pair 1/5 on cells {D3|E3} means
- 1 can be removed from E2
Passo 13
Bi-value Universal Grave
valore: 33.8
categoria doc: BUG
BUG+1 found in E7, 9 must be the solution
All other incomplete cells contain two candidates apart from E7. Other candidates in E7 would create two or more solutions so they can be removed.
Last candidate 9 in E7 changed to solution
Last candidate 1 in E8 changed to solution
Last candidate 8 in F7 changed to solution
Last candidate 7 in H8 changed to solution
Last candidate 1 in J9 changed to solution
Passo 14
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 7 in C7 changed to solution
Last candidate 9 in C8 changed to solution
Last candidate 5 in D7 changed to solution
Last candidate 7 in D9 changed to solution
Last candidate 7 in E2 changed to solution
Last candidate 5 in E3 changed to solution
Last candidate 8 in E5 changed to solution
Last candidate 9 in F1 changed to solution
Last candidate 7 in F5 changed to solution
Last candidate 1 in G2 changed to solution
Last candidate 7 in G6 changed to solution
Last candidate 1 in H6 changed to solution
Last candidate 7 in J1 changed to solution
Last candidate 1 in A1 changed to solution
Last candidate 9 in A2 changed to solution
Last candidate 1 in D3 changed to solution