Passi risolutivi (15)
Passo 1
Hidden Singles
valore: 5.3
categoria doc: Getting_Started
2 in A4 is last in box
3 in A7 is last in row/box
3 in G1 is last in column/box
4 in H5 is last in box
5 in J9 is last in column
Passo 2
Hidden Singles
valore: 4.3
categoria doc: Getting_Started
1 in B5 is last in box
3 in D5 is last in column
3 in H9 is last in row/column/box
3 in J6 is last in row/box
4 in A8 is last in row/box
4 in F7 is last in column
4 in G9 is last in column
Passo 3
Hidden Singles
valore: 3.5
categoria doc: Getting_Started
4 in D6 is last in row/column/box
5 in B8 is last in column/box
7 in E7 is last in column/box
8 in E6 is last in column
Passo 4
Hidden Singles
valore: 3
categoria doc: Getting_Started
2 in J7 is last in column
7 in B1 is last in column
7 in F6 is last in column/box
8 in B3 is last in row
8 in C8 is last in column/box
Passo 5
Hidden Singles
valore: 2.6
categoria doc: Getting_Started
1 in C7 is last in box
1 in J8 is last in column
Passo 6
Naked Pair
valore: 11.6
categoria doc: Naked_Candidates
Naked Pair 2/9 on cells {E5|F5} means
- 9 can be removed from D4
- 9 can be removed from E4
- 9 can be removed from F4
Last candidate 1 in D4 changed to solution
Passo 7
Simple Colouring
valore: 108.7
categoria doc: Singles_Chains
(RULE 4): Uncoloured candidate 6 in H2 can see two different coloured candidates of 6 elsewhere.
Passo 8
XY-Chain
valore: 139.5
categoria doc: XY_Chains
length=4, chain ends: C1 and E5
This proves 2 is the solution at one or possibly both ends of the chain
-2[C1]+9[C1]-9[C9]+6[C9]-6[E9]+9[E9]-9[E5]+2[E5]
- 2 can be removed from E1
Passo 9
Hidden Singles
valore: 2.1
categoria doc: Getting_Started
2 in C1 is last in column
Passo 10
Simple Colouring
valore: 101.8
categoria doc: Singles_Chains
(RULE 4): Uncoloured candidate 9 in H2 can see two different coloured candidates of 9 elsewhere.
Passo 11
X-Cycle
valore: 120.5
categoria doc: X_Cycles
X-CYCLE on 9 (Discontinuous Alternating Nice Loop, length 6):
+9[C2]-9[A1]+9[E1]-9[E9]+9[C9]-9[C2]
- Contradiction: When C2 is set to 9 the chain implies it cannot be 9 - it can be removed
Last candidate 6 in C2 changed to solution
Last candidate 9 in C9 changed to solution
Last candidate 6 in E9 changed to solution
Passo 12
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 6 in B7 changed to solution
Last candidate 5 in E4 changed to solution
Last candidate 6 in F4 changed to solution
Last candidate 9 in H7 changed to solution
Last candidate 9 in B6 changed to solution
Last candidate 6 in G8 changed to solution
Last candidate 8 in H4 changed to solution
Last candidate 9 in J4 changed to solution
Passo 13
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 6 in A6 changed to solution
Last candidate 1 in H2 changed to solution
Last candidate 6 in H3 changed to solution
Last candidate 7 in J3 changed to solution
Last candidate 8 in J2 changed to solution
Passo 14
Hidden Singles
valore: 0.7
categoria doc: Getting_Started
5 in A3 is last in column
5 in F2 is last in row/box
7 in D2 is last in row/column/box
Passo 15
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 9 in A2 changed to solution
Last candidate 2 in G2 changed to solution
Last candidate 9 in G3 changed to solution
Last candidate 1 in A1 changed to solution
Last candidate 2 in D3 changed to solution
Last candidate 9 in D8 changed to solution
Last candidate 9 in E1 changed to solution
Last candidate 1 in E3 changed to solution
Last candidate 2 in E5 changed to solution
Last candidate 9 in F5 changed to solution
Last candidate 2 in F8 changed to solution