Passi risolutivi (33)
Passo 1
Hidden Singles
valore: 5.7
categoria doc: Getting_Started
1 in F7 is last in column/box
1 in G3 is last in column
2 in G6 is last in column/box
6 in C4 is last in column/box
9 in A8 is last in column
9 in H9 is last in row/box
Passo 2
Hidden Singles
valore: 4.7
categoria doc: Getting_Started
6 in A2 is last in column/box
6 in B8 is last in column
6 in F9 is last in row/box
6 in H7 is last in row/box
9 in C3 is last in column
Passo 3
Naked Pair
valore: 21.6
categoria doc: Naked_Candidates
Naked Pair 3/8 on cells {A5|A6} means
- 3 can be removed from A3
- 8 can be removed from A7
- 3/8 can be removed from B5
- 3/8 can be removed from C6
Passo 4
Hidden Pair
valore: 41.5
categoria doc: Hidden_Candidates
Hidden Pair 1/9 in Row D, on cells {D1|D5}
- removes 2/4/5 from D1
- removes 4/5/8 from D5
Passo 5
Hidden Singles
valore: 4.1
categoria doc: Getting_Started
5 in D2 is last in row
Passo 6
Pointing Pairs
valore: 58.6
categoria doc: Intersection_Removal
Pair: between Box 4 and Row E:
- 2 can be removed from E8
- 2 can be removed from E9
Passo 7
Pointing Pairs
valore: 57.8
categoria doc: Intersection_Removal
Pair: between Box 9 and Row J:
- 2 can be removed from J2
- 2 can be removed from J3
Passo 8
Pointing Pairs
valore: 57.4
categoria doc: Intersection_Removal
Pair: between Box 3 and Col 9:
- 3 can be removed from G9
Passo 9
Pointing Pairs
valore: 56.9
categoria doc: Intersection_Removal
Pair: between Box 6 and Col 9:
- 4 can be removed from C9
Passo 10
Pointing Pairs
valore: 55.7
categoria doc: Intersection_Removal
Pair: between Box 6 and Row E:
- 7 can be removed from E4
- 7 can be removed from E5
- 7 can be removed from E6
Passo 11
Line/Box Reduction
valore: 73.2
categoria doc: Intersection_Removal
Pair: between Col 4 and Box 8:
- 7 can be removed from H5
- 7 can be removed from J5
Passo 12
Hidden Singles
valore: 3.6
categoria doc: Getting_Started
7 in H2 is last in row
Passo 13
Hidden Singles
valore: 3.5
categoria doc: Getting_Started
2 in E2 is last in column
Passo 14
Naked Pair
valore: 16.4
categoria doc: Naked_Candidates
Naked Pair 3/8 on cells {A5|H5} means
- 3/8 can be removed from E5
- 3 can be removed from F5
- 3/8 can be removed from J5
Last candidate 4 in J5 changed to solution
Passo 15
Hidden Singles
valore: 3
categoria doc: Getting_Started
4 in A3 is last in column
4 in G1 is last in row/box
Passo 16
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 2 in A7 changed to solution
Passo 17
Hidden Singles
valore: 2.4
categoria doc: Getting_Started
2 in D9 is last in column
2 in J8 is last in row/box
4 in C7 is last in row/column/box
4 in F2 is last in row/column/box
5 in G7 is last in row
5 in J3 is last in box
Passo 18
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 8 in D8 changed to solution
Passo 19
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 4 in D4 changed to solution
Last candidate 7 in E8 changed to solution
Passo 20
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 4 in E9 changed to solution
Last candidate 3 in G8 changed to solution
Passo 21
Pointing Pairs
valore: 25.2
categoria doc: Intersection_Removal
Pair: between Box 4 and Col 1:
- 3 can be removed from B1
- 3 can be removed from C1
- 3 can be removed from H1
Passo 22
Rectangle Elimination
valore: 41.3
categoria doc: Rectangle_Elimination
If +8[B1] then -8[B7] forcing +8[J7] which removes all 8s from box 7, so B1 cannot be 8
Passo 23
Pointing Pairs
valore: 24.3
categoria doc: Intersection_Removal
Pair: between Box 1 and Row C:
- 8 can be removed from C9
Passo 24
XY-Chain
valore: 151.6
categoria doc: XY_Chains
length=7, chain ends: B5 and J7
This proves 7 is the solution at one or possibly both ends of the chain
-7[B5]+5[B5]-5[C6]+7[C6]-7[F6]+3[F6]-3[E4]+8[E4]-8[G4]+7[G4]-7[G9]+8[G9]-8[J7]+7[J7]
- 7 can be removed from B7
Last candidate 8 in B7 changed to solution
Passo 25
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 7 in J7 changed to solution
Passo 26
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 8 in G9 changed to solution
Passo 27
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 7 in G4 changed to solution
Passo 28
Bi-value Universal Grave
valore: 38.8
categoria doc: BUG
BUG+1 found in E6, 3 must be the solution
All other incomplete cells contain two candidates apart from E6. Other candidates in E6 would create two or more solutions so they can be removed.
Last candidate 3 in E6 changed to solution
Passo 29
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 8 in A6 changed to solution
Last candidate 1 in E1 changed to solution
Last candidate 8 in E4 changed to solution
Last candidate 7 in F6 changed to solution
Passo 30
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 3 in A5 changed to solution
Last candidate 5 in C6 changed to solution
Last candidate 9 in D1 changed to solution
Last candidate 5 in E5 changed to solution
Last candidate 9 in F5 changed to solution
Last candidate 3 in J4 changed to solution
Passo 31
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 7 in B5 changed to solution
Last candidate 8 in C1 changed to solution
Last candidate 1 in D5 changed to solution
Last candidate 3 in F1 changed to solution
Last candidate 8 in H5 changed to solution
Last candidate 8 in J2 changed to solution
Passo 32
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 3 in B9 changed to solution
Last candidate 3 in C2 changed to solution
Last candidate 2 in H1 changed to solution
Passo 33
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 5 in B1 changed to solution
Last candidate 2 in B3 changed to solution
Last candidate 7 in C9 changed to solution
Last candidate 3 in H3 changed to solution