Passi risolutivi (30)
Passo 1
Naked Singles
valore: 3
categoria doc: Getting_Started
Last candidate 6 in B3 changed to solution
Last candidate 6 in H7 changed to solution
Last candidate 6 in J2 changed to solution
Passo 2
Naked Singles
valore: 4
categoria doc: Getting_Started
Last candidate 5 in C3 changed to solution
Last candidate 3 in D3 changed to solution
Last candidate 1 in E2 changed to solution
Last candidate 7 in H9 changed to solution
Passo 3
Naked Singles
valore: 2.3
categoria doc: Getting_Started
Last candidate 7 in G3 changed to solution
Passo 4
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 8 in J3 changed to solution
Passo 5
Hidden Singles
valore: 4.2
categoria doc: Getting_Started
2 in C9 is last in row
5 in A5 is last in row/box
8 in A8 is last in column/box
Passo 6
Hidden Singles
valore: 3.9
categoria doc: Getting_Started
6 in C8 is last in row/box
7 in A6 is last in row/box
Passo 7
Naked Singles
valore: 1.7
categoria doc: Getting_Started
Last candidate 4 in E8 changed to solution
Passo 8
Naked Singles
valore: 1.6
categoria doc: Getting_Started
Last candidate 6 in E6 changed to solution
Last candidate 1 in J8 changed to solution
Passo 9
Naked Singles
valore: 1.5
categoria doc: Getting_Started
Last candidate 7 in E1 changed to solution
Passo 10
Hidden Singles
valore: 2.9
categoria doc: Getting_Started
3 in C6 is last in column
6 in G5 is last in row/column/box
Passo 11
XYZ Wing
valore: 165.1
categoria doc: XYZ_Wing
XYZ-Wing pattern. Hinge: F5 (1/4/7), wings F6 J5, therefore
- 4 can be removed from D5
Passo 12
3D Medusa
valore: 217.9
categoria doc: 3D_Medusa
(RULE 5): Uncoloured candidate 8 in D6 can see coloured 8 elsewhere and an oppositely coloured 2 in its own cell. It can be removed.
Passo 13
Hidden Singles
valore: 2.7
categoria doc: Getting_Started
8 in B6 is last in column
Passo 14
Hidden Pair
valore: 25.6
categoria doc: Hidden_Candidates
Hidden Pair 2/8 in Col 5, on cells {D5|H5}
- removes 1/9 from D5
Passo 15
Pointing Pairs
valore: 38
categoria doc: Intersection_Removal
Pair: between Box 5 and Col 4:
- 9 can be removed from C4
Passo 16
Naked Pair
valore: 12
categoria doc: Naked_Candidates
Naked Pair 1/4 on cells {C4|G4} means
- 1/4 can be removed from D4
- 1/4 can be removed from F4
- 4 can be removed from J4
Passo 17
X-Wing
valore: 70.2
categoria doc: X_Wing_Strategy
(Col->Row) 4 taken off C5, based on BJ59
(Col->Row) 4 taken off F5, based on BJ59
Passo 18
Pointing Pairs
valore: 34.7
categoria doc: Intersection_Removal
Pair: between Box 5 and Col 6:
- 4 can be removed from G6
Passo 19
XY-Chain
valore: 216.9
categoria doc: XY_Chains
length=7, chain ends: E9 and G7
This proves 5 is the solution at one or possibly both ends of the chain
-5[E9]+5[E4]-9[E4]+9[D4]-8[D4]+8[H4]-3[H4]+3[J4]-7[J4]+7[J5]-4[J5]+4[J9]-4[G7]+5[G7]
- 5 can be removed from F7
Passo 20
Hidden Singles
valore: 2.3
categoria doc: Getting_Started
5 in G7 is last in column
Passo 21
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 4 in J9 changed to solution
Passo 22
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 7 in J5 changed to solution
Passo 23
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 1 in F5 changed to solution
Last candidate 3 in J4 changed to solution
Passo 24
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 9 in C5 changed to solution
Last candidate 4 in F6 changed to solution
Last candidate 3 in F7 changed to solution
Last candidate 8 in H4 changed to solution
Last candidate 5 in J1 changed to solution
Passo 25
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 4 in B5 changed to solution
Last candidate 9 in D4 changed to solution
Last candidate 2 in D6 changed to solution
Last candidate 6 in F1 changed to solution
Last candidate 2 in H5 changed to solution
Passo 26
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 1 in C4 changed to solution
Last candidate 4 in D1 changed to solution
Last candidate 8 in D5 changed to solution
Last candidate 1 in D7 changed to solution
Last candidate 5 in E4 changed to solution
Last candidate 5 in F9 changed to solution
Last candidate 1 in G6 changed to solution
Last candidate 3 in H1 changed to solution
Passo 27
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 9 in A7 changed to solution
Last candidate 4 in C7 changed to solution
Last candidate 6 in D9 changed to solution
Last candidate 9 in E9 changed to solution
Last candidate 7 in F4 changed to solution
Last candidate 4 in G4 changed to solution
Passo 28
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 2 in A2 changed to solution
Last candidate 1 in B9 changed to solution
Passo 29
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 1 in A1 changed to solution
Last candidate 3 in A9 changed to solution
Last candidate 9 in B1 changed to solution
Last candidate 9 in G2 changed to solution
Passo 30
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 2 in G1 changed to solution