Passi risolutivi (29)
Passo 1
Hidden Singles
valore: 5.4
categoria doc: Getting_Started
1 in B1 is last in column/box
2 in E6 is last in column
2 in J3 is last in column/box
Passo 2
Hidden Singles
valore: 4.9
categoria doc: Getting_Started
4 in E5 is last in row/box
4 in G6 is last in column
Passo 3
Hidden Singles
valore: 4.2
categoria doc: Getting_Started
1 in D5 is last in column/box
4 in H1 is last in box
4 in J7 is last in row
6 in A6 is last in column
6 in E4 is last in row/box
7 in G5 is last in row/box
Passo 4
Naked Singles
valore: 1.8
categoria doc: Getting_Started
Last candidate 9 in J4 changed to solution
Passo 5
Naked Singles
valore: 1.7
categoria doc: Getting_Started
Last candidate 6 in J5 changed to solution
Passo 6
Naked Singles
valore: 1.7
categoria doc: Getting_Started
Last candidate 3 in H5 changed to solution
Last candidate 8 in J2 changed to solution
Passo 7
Naked Singles
valore: 1.5
categoria doc: Getting_Started
Last candidate 1 in J8 changed to solution
Passo 8
Hidden Singles
valore: 2.8
categoria doc: Getting_Started
1 in A7 is last in row/box
1 in E9 is last in column
7 in D6 is last in row
Passo 9
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 9 in F6 changed to solution
Passo 10
Pointing Pairs
valore: 38.8
categoria doc: Intersection_Removal
Pair: between Box 5 and Row F:
- 8 can be removed from F1
Passo 11
Rectangle Elimination
valore: 64
categoria doc: Rectangle_Elimination
If +9[G3] then -9[D3] forcing +9[D9] which removes all 9s from box 9, so G3 cannot be 9
Passo 12
Rectangle Elimination
valore: 63.3
categoria doc: Rectangle_Elimination
If +9[E2] then -9[E8] forcing +9[G8] which removes all 9s from box 7, so E2 cannot be 9
Passo 13
Y-Wing
valore: 99
categoria doc: Y_Wing_Strategy
Y-Wing pattern. Hinge: E8 (7/9), wings D9 E2, therefore
- 3 can be removed from D3
- 3 can be removed from E7
Passo 14
XY-Chain
valore: 157.4
categoria doc: XY_Chains
length=4, chain ends: D9 and G7
This proves 3 is the solution at one or possibly both ends of the chain
-3[D9]+9[D9]-9[D3]+5[D3]-5[G3]+6[G3]-6[G7]+3[G7]
- 3 can be removed from F7
- 3 can be removed from G9
Passo 15
Hidden Singles
valore: 2.3
categoria doc: Getting_Started
3 in D9 is last in column/box
3 in F4 is last in row
3 in G7 is last in row/column/box
Passo 16
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 5 in D4 changed to solution
Passo 17
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 8 in C4 changed to solution
Last candidate 9 in D3 changed to solution
Last candidate 8 in F5 changed to solution
Passo 18
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 9 in A5 changed to solution
Last candidate 2 in B5 changed to solution
Passo 19
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 5 in C5 changed to solution
Passo 20
Hidden Singles
valore: 1.5
categoria doc: Getting_Started
8 in E1 is last in column
9 in E8 is last in row/box
Passo 21
Hidden Singles
valore: 1.3
categoria doc: Getting_Started
7 in A8 is last in column
Passo 22
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 3 in A2 changed to solution
Passo 23
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 8 in A3 changed to solution
Last candidate 7 in E2 changed to solution
Passo 24
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 5 in E7 changed to solution
Last candidate 5 in F1 changed to solution
Passo 25
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 3 in E3 changed to solution
Last candidate 7 in F7 changed to solution
Last candidate 9 in G1 changed to solution
Passo 26
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 7 in C1 changed to solution
Last candidate 8 in G9 changed to solution
Last candidate 6 in H2 changed to solution
Passo 27
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 4 in B9 changed to solution
Last candidate 9 in C2 changed to solution
Last candidate 5 in G3 changed to solution
Last candidate 6 in G8 changed to solution
Last candidate 2 in H7 changed to solution
Passo 28
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 6 in B3 changed to solution
Last candidate 8 in B8 changed to solution
Last candidate 6 in C7 changed to solution
Last candidate 2 in C9 changed to solution
Last candidate 9 in H9 changed to solution
Passo 29
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 4 in C3 changed to solution