Passi risolutivi (27)
Passo 1
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 2 in C3 changed to solution
Passo 2
Hidden Singles
valore: 5
categoria doc: Getting_Started
2 in F8 is last in row/box
2 in G1 is last in row
6 in B9 is last in row/box
7 in C8 is last in row
9 in E5 is last in column/box
Passo 3
Hidden Singles
valore: 4.3
categoria doc: Getting_Started
1 in F4 is last in row
2 in A9 is last in column/box
3 in C9 is last in column/box
4 in C1 is last in row
6 in G7 is last in row
Passo 4
Naked Singles
valore: 1.9
categoria doc: Getting_Started
Last candidate 8 in C5 changed to solution
Passo 5
Naked Singles
valore: 1.8
categoria doc: Getting_Started
Last candidate 7 in A4 changed to solution
Last candidate 1 in G5 changed to solution
Passo 6
Naked Singles
valore: 1.7
categoria doc: Getting_Started
Last candidate 5 in A6 changed to solution
Last candidate 7 in G2 changed to solution
Last candidate 8 in G9 changed to solution
Last candidate 3 in J5 changed to solution
Passo 7
Naked Singles
valore: 1.5
categoria doc: Getting_Started
Last candidate 9 in A3 changed to solution
Passo 8
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 6 in F3 changed to solution
Passo 9
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 5 in J3 changed to solution
Passo 10
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 3 in E3 changed to solution
Passo 11
Hidden Singles
valore: 2.3
categoria doc: Getting_Started
3 in H2 is last in row/column/box
7 in E6 is last in row/column/box
7 in J7 is last in row/column/box
Passo 12
Naked Pair
valore: 10.7
categoria doc: Naked_Candidates
Naked Pair 4/8 on cells {E4|F6} means
- 4/8 can be removed from D4
- 4/8 can be removed from D6
Passo 13
Naked Pair
valore: 10.3
categoria doc: Naked_Candidates
Naked Pair 4/6 on cells {H4|H6} means
- 6 can be removed from H1
- 6 can be removed from J4
- 6 can be removed from J6
Passo 14
Hidden Singles
valore: 2
categoria doc: Getting_Started
6 in J1 is last in row/column/box
Passo 15
Pointing Pairs
valore: 29.3
categoria doc: Intersection_Removal
Pair: between Box 6 and Row D:
- 9 can be removed from D2
Passo 16
W-Wing
valore: 46.1
categoria doc: W_Wings
W-Wing (single). Either there is a 8 in A2 or in B8. They are connected through 1 in J2/J8, therefore
- 8 can be removed from A7
- 8 can be removed from A8
- 8 can be removed from B1
- 8 can be removed from B2
Passo 17
Hidden Singles
valore: 1.8
categoria doc: Getting_Started
8 in A2 is last in row/box
8 in B8 is last in row/box
Passo 18
Hidden Singles
valore: 1.6
categoria doc: Getting_Started
8 in D7 is last in row
Passo 19
XY-Chain
valore: 100.1
categoria doc: XY_Chains
length=4, chain ends: D9 and H1
This proves 9 is the solution at one or possibly both ends of the chain
-9[D9]+5[D9]-5[E9]+5[E1]-8[E1]+8[F1]-9[F1]+9[H1]
- 9 can be removed from H9
Passo 20
Hidden Singles
valore: 1.5
categoria doc: Getting_Started
9 in D9 is last in column
Passo 21
Bi-value Universal Grave
valore: 42.1
categoria doc: BUG
BUG+1 found in H8, 1 must be the solution
All other incomplete cells contain two candidates apart from H8. Other candidates in H8 would create two or more solutions so they can be removed.
Last candidate 1 in H8 changed to solution
Passo 22
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 4 in A8 changed to solution
Last candidate 9 in H1 changed to solution
Last candidate 5 in H9 changed to solution
Last candidate 9 in J8 changed to solution
Passo 23
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 1 in A7 changed to solution
Last candidate 5 in D8 changed to solution
Last candidate 1 in E9 changed to solution
Last candidate 8 in F1 changed to solution
Last candidate 1 in J2 changed to solution
Passo 24
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 5 in B2 changed to solution
Last candidate 4 in D2 changed to solution
Last candidate 5 in E1 changed to solution
Last candidate 4 in E7 changed to solution
Last candidate 4 in F6 changed to solution
Passo 25
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 1 in B1 changed to solution
Last candidate 8 in E4 changed to solution
Last candidate 9 in F2 changed to solution
Last candidate 6 in H6 changed to solution
Passo 26
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 3 in D6 changed to solution
Last candidate 4 in H4 changed to solution
Last candidate 2 in J4 changed to solution
Passo 27
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 3 in B4 changed to solution
Last candidate 2 in B6 changed to solution
Last candidate 6 in D4 changed to solution
Last candidate 8 in J6 changed to solution