Passi risolutivi (17)
Passo 1
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 5 in C4 changed to solution
Last candidate 6 in E4 changed to solution
Last candidate 4 in J4 changed to solution
Last candidate 1 in A4 changed to solution
Passo 2
Hidden Singles
valore: 5.4
categoria doc: Getting_Started
3 in F8 is last in column/box
4 in D5 is last in row/column/box
7 in E7 is last in row
7 in F1 is last in box
Passo 3
Hidden Singles
valore: 4.8
categoria doc: Getting_Started
1 in F5 is last in column/box
2 in E3 is last in row
3 in D6 is last in row/box
Passo 4
Hidden Singles
valore: 4.5
categoria doc: Getting_Started
5 in F6 is last in row/box
Passo 5
Naked Singles
valore: 2
categoria doc: Getting_Started
Last candidate 7 in G6 changed to solution
Last candidate 9 in A6 changed to solution
Last candidate 8 in E6 changed to solution
Last candidate 5 in G5 changed to solution
Passo 6
Naked Singles
valore: 1.8
categoria doc: Getting_Started
Last candidate 9 in E5 changed to solution
Passo 7
Naked Pair
valore: 17.2
categoria doc: Naked_Candidates
Naked Pair 6/8 on cells {B3|F3} means
- 6 can be removed from A3
- 6/8 can be removed from D3
- 8 can be removed from H3
Last candidate 1 in D3 changed to solution
Last candidate 4 in G3 changed to solution
Passo 8
Hidden Singles
valore: 3.1
categoria doc: Getting_Started
1 in G8 is last in row
1 in J1 is last in column/box
Passo 9
Hidden Singles
valore: 2.8
categoria doc: Getting_Started
1 in B7 is last in row/column/box
5 in J7 is last in row
9 in D1 is last in column
Passo 10
Hidden Singles
valore: 2.5
categoria doc: Getting_Started
9 in B8 is last in row/box
9 in F7 is last in column
Passo 11
Hidden Pair
valore: 22.3
categoria doc: Hidden_Candidates
Hidden Pair 4/7 in Col 9, on cells {A9|H9}
- removes 2/6 from A9
- removes 2/6/8 from H9
Passo 12
Hidden Singles
valore: 2.2
categoria doc: Getting_Started
6 in A8 is last in box
Passo 13
Pointing Pairs
valore: 28.5
categoria doc: Intersection_Removal
Pair: between Box 3 and Row C:
- 2 can be removed from C1
- 2 can be removed from C5
Passo 14
XY-Chain
valore: 152
categoria doc: XY_Chains
length=6. This XY-Chain is continuous and one value in each cell must be the solution, so all off-chain candidates can be removed
-8[B3]+6[B3]-6[F3]+8[F3]-8[D2]+6[D2]-6[D7]+2[D7]-2[C7]+4[C7]-4[C1]+8[C1]-8[B3]
- 6 can be removed from D9
- 2 can be removed from H7
- 8 can be removed from B1
- 8 can be removed from B2
Last candidate 2 in B1 changed to solution
Passo 15
Hidden Singles
valore: 1.6
categoria doc: Getting_Started
2 in A5 is last in row/column/box
Passo 16
Bi-value Universal Grave
valore: 45.4
categoria doc: BUG
BUG+1 found in H2, 3 must be the solution
All other incomplete cells contain two candidates apart from H2. Other candidates in H2 would create two or more solutions so they can be removed.
Last candidate 3 in H2 changed to solution
Last candidate 5 in H3 changed to solution
Last candidate 6 in H5 changed to solution
Last candidate 4 in H7 changed to solution
Last candidate 7 in H9 changed to solution
Last candidate 9 in J2 changed to solution
Last candidate 3 in J5 changed to solution
Last candidate 6 in J9 changed to solution
Passo 17
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 7 in A2 changed to solution
Last candidate 3 in A3 changed to solution
Last candidate 4 in A9 changed to solution
Last candidate 6 in B2 changed to solution
Last candidate 8 in B3 changed to solution
Last candidate 7 in B5 changed to solution
Last candidate 4 in C1 changed to solution
Last candidate 8 in C5 changed to solution
Last candidate 2 in C7 changed to solution
Last candidate 7 in C8 changed to solution
Last candidate 8 in D2 changed to solution
Last candidate 6 in D7 changed to solution
Last candidate 2 in D9 changed to solution
Last candidate 6 in F3 changed to solution
Last candidate 8 in F9 changed to solution
Last candidate 2 in G2 changed to solution
Last candidate 9 in G9 changed to solution
Last candidate 8 in H1 changed to solution
Last candidate 2 in H8 changed to solution
Last candidate 5 in A1 changed to solution