Passi risolutivi (18)
Passo 1
Hidden Singles
valore: 4.7
categoria doc: Getting_Started
6 in E2 is last in column/box
7 in H9 is last in column/box
8 in C9 is last in column/box
8 in E5 is last in row/box
8 in J1 is last in column/box
9 in A4 is last in row/box
9 in F1 is last in row/box
Passo 2
Naked Singles
valore: 2
categoria doc: Getting_Started
Last candidate 5 in C5 changed to solution
Last candidate 7 in C4 changed to solution
Passo 3
Hidden Singles
valore: 3.5
categoria doc: Getting_Started
3 in E9 is last in row
5 in F4 is last in column/box
7 in A2 is last in column
7 in D6 is last in column/box
8 in B6 is last in row/column/box
8 in H4 is last in row/column/box
9 in J3 is last in row
Passo 4
Hidden Singles
valore: 2.9
categoria doc: Getting_Started
3 in A6 is last in row/column
3 in B2 is last in column/box
3 in D5 is last in row/box
Passo 5
Hidden Singles
valore: 2.6
categoria doc: Getting_Started
9 in H7 is last in row/column/box
Passo 6
Naked Pair
valore: 12.5
categoria doc: Naked_Candidates
Naked Pair 1/4 on cells {H2|J2} means
- 4 can be removed from G1
- 4 can be removed from G3
Passo 7
Naked Pair
valore: 12.4
categoria doc: Naked_Candidates
Naked Pair 5/7 on cells {G1|G3} means
- 5 can be removed from G7
Passo 8
Pointing Pairs
valore: 36.3
categoria doc: Intersection_Removal
Pair: between Box 5 and Row F:
- 2 can be removed from F7
- 2 can be removed from F9
Passo 9
Pointing Pairs
valore: 35.9
categoria doc: Intersection_Removal
Pair: between Box 4 and Row D:
- 4 can be removed from D9
Passo 10
Y-Wing
valore: 94.6
categoria doc: Y_Wing_Strategy
Y-Wing pattern. Hinge: J4 (1/6), wings G6 J2, therefore
- 4 can be removed from J6
Passo 11
Hidden Singles
valore: 2.3
categoria doc: Getting_Started
4 in G6 is last in column/box
Passo 12
Hidden Singles
valore: 2.1
categoria doc: Getting_Started
6 in A8 is last in column
Passo 13
Rectangle Elimination
valore: 49.5
categoria doc: Rectangle_Elimination
If +1[E1] then -1[A1] forcing +1[A7] which removes all 1s from box 6, so E1 cannot be 1
Passo 14
XY-Chain
valore: 166
categoria doc: XY_Chains
length=6, chain ends: F9 and J2
This proves 4 is the solution at one or possibly both ends of the chain
-4[F9]+6[F9]-6[F6]+2[F6]-2[F5]+1[F5]-1[D4]+6[D4]-6[J4]+1[J4]-1[J2]+4[J2]
- 4 can be removed from J9
Passo 15
Hidden Singles
valore: 1.9
categoria doc: Getting_Started
4 in F9 is last in column
Passo 16
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 1 in F7 changed to solution
Last candidate 2 in F5 changed to solution
Last candidate 6 in F6 changed to solution
Last candidate 1 in H5 changed to solution
Last candidate 6 in J4 changed to solution
Last candidate 2 in J6 changed to solution
Last candidate 5 in J9 changed to solution
Passo 17
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 2 in A9 changed to solution
Last candidate 4 in C7 changed to solution
Last candidate 1 in D4 changed to solution
Last candidate 6 in D9 changed to solution
Last candidate 4 in H2 changed to solution
Last candidate 2 in H8 changed to solution
Last candidate 1 in J2 changed to solution
Last candidate 4 in J8 changed to solution
Last candidate 5 in A7 changed to solution
Last candidate 1 in B8 changed to solution
Last candidate 2 in C3 changed to solution
Last candidate 4 in D3 changed to solution
Last candidate 2 in E7 changed to solution
Last candidate 5 in E8 changed to solution
Passo 18
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 1 in A1 changed to solution
Last candidate 5 in B3 changed to solution
Last candidate 2 in D1 changed to solution
Last candidate 7 in E1 changed to solution
Last candidate 1 in E3 changed to solution
Last candidate 5 in G1 changed to solution
Last candidate 7 in G3 changed to solution
Last candidate 4 in B1 changed to solution