Passi risolutivi (26)
Passo 1
Hidden Singles
valore: 5.3
categoria doc: Getting_Started
3 in E1 is last in column/box
5 in H3 is last in box
6 in B3 is last in row/column/box
9 in G7 is last in column/box
9 in J5 is last in row
Passo 2
Hidden Singles
valore: 4.2
categoria doc: Getting_Started
2 in B1 is last in column
2 in J8 is last in row
4 in C3 is last in column
6 in H7 is last in column/box
7 in H1 is last in row/box
9 in A1 is last in row
9 in C4 is last in box
Passo 3
Hidden Singles
valore: 3.6
categoria doc: Getting_Started
3 in J9 is last in row
4 in G1 is last in column/box
Passo 4
Hidden Singles
valore: 3.2
categoria doc: Getting_Started
3 in B7 is last in box
3 in C5 is last in row
Passo 5
Pointing Pairs
valore: 44.2
categoria doc: Intersection_Removal
Pair: between Box 2 and Row B:
- 1 can be removed from B2
Passo 6
Pointing Pairs
valore: 43.7
categoria doc: Intersection_Removal
Pair: between Box 9 and Col 8:
- 1 can be removed from E9
Passo 7
Pointing Pairs
valore: 42.9
categoria doc: Intersection_Removal
Pair: between Box 1 and Col 1:
- 7 can be removed from D2
- 7 can be removed from F2
Passo 8
Rectangle Elimination
valore: 70.8
categoria doc: Rectangle_Elimination
If +4[D7] then -4[A7] forcing +4[A5] which removes all 4s from box 5, so D7 cannot be 4
Passo 9
Naked Pair
valore: 13.8
categoria doc: Naked_Candidates
Naked Pair 2/8 on cells {D2|D7} means
- 8 can be removed from D3
- 2 can be removed from D5
- 8 can be removed from D8
Passo 10
Line/Box Reduction
valore: 53.9
categoria doc: Intersection_Removal
Pair: between Col 8 and Box 8:
- 8 can be removed from G9
- 8 can be removed from H9
Passo 11
Y-Wing
valore: 106.7
categoria doc: Y_Wing_Strategy
Y-Wing pattern. Hinge: E9 (5/8), wings D7 E4, therefore
- 2 can be removed from E7
Passo 12
Line/Box Reduction
valore: 52.3
categoria doc: Intersection_Removal
Pair: between Row F and Box 4:
- 2 can be removed from F4
- 2 can be removed from F5
Passo 13
3D Medusa
valore: 206.9
categoria doc: 3D_Medusa
(RULE 4): Uncoloured candidate 8 in A5 can see two different coloured candidates of 8 elsewhere.
Passo 14
Pointing Pairs
valore: 38
categoria doc: Intersection_Removal
Pair: between Box 2 and Row B:
- 8 can be removed from B2
- 8 can be removed from B9
Passo 15
Naked Triple
valore: 49
categoria doc: Naked_Candidates
Naked Triple 4/5/7 on cells {A5|D5|F5} means
- 4/5 can be removed from B5
- 5 can be removed from E5
Passo 16
X-Wing
valore: 71.8
categoria doc: X_Wing_Strategy
(Col->Row) 8 taken off C2, based on AD27
(Col->Row) 8 taken off E7, based on AD27
Last candidate 1 in E7 changed to solution
Passo 17
XYZ Wing
valore: 137
categoria doc: XYZ_Wing
XYZ-Wing pattern. Hinge: G5 (1/6/8), wings B5 G6, therefore
- 1 can be removed from H5
Passo 18
XY-Chain
valore: 211.7
categoria doc: XY_Chains
length=7, chain ends: D5 and F3
This proves 7 is the solution at one or possibly both ends of the chain
-7[D5]+4[D5]-4[A5]+5[A5]-5[A2]+8[A2]-8[C1]+1[C1]-1[J1]+8[J1]-8[J3]+1[J3]-1[F3]+7[F3]
- 7 can be removed from D3
- 7 can be removed from F5
Last candidate 9 in D3 changed to solution
Passo 19
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 8 in E3 changed to solution
Passo 20
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 2 in D2 changed to solution
Last candidate 5 in E9 changed to solution
Last candidate 1 in J3 changed to solution
Passo 21
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 8 in D7 changed to solution
Last candidate 2 in E4 changed to solution
Last candidate 1 in F2 changed to solution
Last candidate 7 in F3 changed to solution
Last candidate 1 in G9 changed to solution
Last candidate 8 in J1 changed to solution
Passo 22
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 4 in A7 changed to solution
Last candidate 1 in C1 changed to solution
Last candidate 7 in C2 changed to solution
Last candidate 6 in E5 changed to solution
Last candidate 6 in G6 changed to solution
Last candidate 4 in H9 changed to solution
Passo 23
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 5 in A5 changed to solution
Last candidate 5 in B2 changed to solution
Last candidate 7 in B9 changed to solution
Last candidate 8 in C9 changed to solution
Last candidate 9 in E6 changed to solution
Last candidate 2 in F7 changed to solution
Last candidate 8 in G5 changed to solution
Last candidate 8 in H8 changed to solution
Passo 24
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 8 in A2 changed to solution
Last candidate 8 in B4 changed to solution
Last candidate 1 in B5 changed to solution
Last candidate 4 in F5 changed to solution
Last candidate 5 in G8 changed to solution
Last candidate 3 in H4 changed to solution
Last candidate 2 in H5 changed to solution
Passo 25
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 4 in B6 changed to solution
Last candidate 7 in D5 changed to solution
Last candidate 3 in D6 changed to solution
Last candidate 5 in F4 changed to solution
Last candidate 3 in F8 changed to solution
Last candidate 1 in H6 changed to solution
Passo 26
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 4 in D8 changed to solution