Passi risolutivi (30)
Passo 1
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 4 in J6 changed to solution
Passo 2
Hidden Singles
valore: 5.6
categoria doc: Getting_Started
2 in C2 is last in column
2 in E1 is last in row/box
5 in A5 is last in column
5 in D8 is last in column/box
8 in D5 is last in row/box
9 in F5 is last in row/box
Passo 3
Hidden Singles
valore: 4.8
categoria doc: Getting_Started
2 in A8 is last in row/box
5 in E3 is last in row/box
5 in H1 is last in column
Passo 4
Hidden Singles
valore: 4.3
categoria doc: Getting_Started
3 in H3 is last in column
4 in G1 is last in column/box
5 in B2 is last in row/column/box
5 in J4 is last in row/column/box
Passo 5
Hidden Singles
valore: 3.7
categoria doc: Getting_Started
2 in H4 is last in column/box
2 in J9 is last in row
7 in B3 is last in row/box
Passo 6
Naked Singles
valore: 1.8
categoria doc: Getting_Started
Last candidate 1 in J3 changed to solution
Passo 7
Hidden Singles
valore: 3.3
categoria doc: Getting_Started
1 in A1 is last in box
1 in D2 is last in column
7 in G5 is last in box
Passo 8
Naked Singles
valore: 1.5
categoria doc: Getting_Started
Last candidate 6 in G2 changed to solution
Passo 9
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 9 in G6 changed to solution
Passo 10
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 6 in H6 changed to solution
Passo 11
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 3 in E6 changed to solution
Passo 12
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 8 in A6 changed to solution
Passo 13
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 1 in B6 changed to solution
Passo 14
Hidden Singles
valore: 2.2
categoria doc: Getting_Started
3 in D9 is last in row
3 in F2 is last in column/box
Passo 15
Hidden Pair
valore: 20.4
categoria doc: Hidden_Candidates
Hidden Pair 1/3 in Col 8, on cells {C8|G8}
- removes 4/9 from C8
Passo 16
Pointing Pairs
valore: 29.7
categoria doc: Intersection_Removal
Pair: between Box 5 and Row E:
- 4 can be removed from E7
- 4 can be removed from E9
Passo 17
Unique Rectangle Type 1
valore: 38.5
categoria doc: Unique_Rectangle
Uniqueness Type 1 removing 7/8 at H7 because of H2,J2,J7
Last candidate 4 in H7 changed to solution
Passo 18
Rectangle Elimination
valore: 44.7
categoria doc: Rectangle_Elimination
If +6[C9] then -6[C5] forcing +6[E5] which removes all 6s from box 6, so C9 cannot be 6
Passo 19
XY-Chain
valore: 167.3
categoria doc: XY_Chains
length=7, chain ends: C8 and E9
This proves 1 is the solution at one or possibly both ends of the chain
-1[C8]+3[C8]-3[A7]+6[A7]-6[A3]+9[A3]-9[C3]+6[C3]-6[C5]+4[C5]-4[E5]+6[E5]-6[E9]+1[E9]
- 1 can be removed from C9
Passo 20
Hidden Singles
valore: 1.7
categoria doc: Getting_Started
1 in C8 is last in row/box
1 in E9 is last in column
Passo 21
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 3 in G8 changed to solution
Passo 22
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 1 in G7 changed to solution
Passo 23
Hidden Singles
valore: 1.4
categoria doc: Getting_Started
3 in A7 is last in column/box
3 in C4 is last in row
Passo 24
Naked Pair
valore: 6.3
categoria doc: Naked_Candidates
Naked Pair 4/9 on cells {B8|C9} means
- 4/9 can be removed from B9
Passo 25
Naked Pair
valore: 6.2
categoria doc: Naked_Candidates
Naked Pair 6/8 on cells {B7|B9} means
- 6 can be removed from B4
Passo 26
Bi-value Universal Grave
valore: 35.5
categoria doc: BUG
BUG+1 found in E4, 6 must be the solution
All other incomplete cells contain two candidates apart from E4. Other candidates in E4 would create two or more solutions so they can be removed.
Last candidate 6 in E4 changed to solution
Passo 27
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 9 in A4 changed to solution
Last candidate 7 in D4 changed to solution
Last candidate 4 in E5 changed to solution
Last candidate 7 in E7 changed to solution
Passo 28
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 6 in A3 changed to solution
Last candidate 4 in B4 changed to solution
Last candidate 6 in C5 changed to solution
Last candidate 6 in D1 changed to solution
Last candidate 4 in F8 changed to solution
Last candidate 8 in J7 changed to solution
Passo 29
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 6 in B7 changed to solution
Last candidate 9 in B8 changed to solution
Last candidate 9 in C3 changed to solution
Last candidate 7 in F1 changed to solution
Last candidate 6 in F9 changed to solution
Last candidate 9 in H9 changed to solution
Last candidate 7 in J2 changed to solution
Passo 30
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 8 in B9 changed to solution
Last candidate 4 in C9 changed to solution
Last candidate 8 in H2 changed to solution
Last candidate 7 in H8 changed to solution