Passi risolutivi (37)
Passo 1
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 4 in C9 changed to solution
Passo 2
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 1 in F9 changed to solution
Passo 3
Naked Singles
valore: 2.7
categoria doc: Getting_Started
Last candidate 3 in A9 changed to solution
Last candidate 5 in E9 changed to solution
Passo 4
Naked Singles
valore: 2.7
categoria doc: Getting_Started
Last candidate 8 in J9 changed to solution
Passo 5
Hidden Singles
valore: 5
categoria doc: Getting_Started
3 in G7 is last in row/column/box
5 in J8 is last in row/column/box
8 in H3 is last in row/box
9 in G4 is last in row/box
Passo 6
Naked Singles
valore: 2.3
categoria doc: Getting_Started
Last candidate 6 in B4 changed to solution
Passo 7
Hidden Singles
valore: 4.3
categoria doc: Getting_Started
2 in H5 is last in box
6 in C8 is last in row/box
7 in J1 is last in row
8 in C1 is last in row
Passo 8
Hidden Singles
valore: 3.8
categoria doc: Getting_Started
2 in A8 is last in column/box
6 in H2 is last in box
Passo 9
Naked Pair
valore: 17.7
categoria doc: Naked_Candidates
Naked Pair 1/9 on cells {A1|A7} means
- 1 can be removed from A2
- 9 can be removed from A5
- 9 can be removed from A6
Passo 10
Naked Pair
valore: 17.3
categoria doc: Naked_Candidates
Naked Pair 1/9 on cells {A7|B7} means
- 9 can be removed from D7
- 9 can be removed from E7
- 1 can be removed from H7
Passo 11
Naked Pair
valore: 16.9
categoria doc: Naked_Candidates
Naked Pair 1/4 on cells {H6|J4} means
- 4 can be removed from J5
- 1/4 can be removed from J6
Passo 12
Line/Unit Reduction
valore: 65.5
categoria doc: Intersection_Removal
Line/Box Reduction: 6s in box 5 remove the following in the same box:
- 6 can be removed from D5
- 6 can be removed from D6
- 6 can be removed from E5
- 6 can be removed from E6
Passo 13
Unique Rectangle 2+
valore: 160.9
categoria doc: Unique_Rectangles
Uniqueness Type 4 (Row) removing 3 from roof because of J5,J6,F5,F6
Passo 14
Hidden Pair
valore: 30.5
categoria doc: Hidden_Candidates
Hidden Pair 3/5 in Box 5, on cells {D5|D6}
- removes 4/8/9 from D5
- removes 1/4/9 from D6
Passo 15
Hidden Singles
valore: 2.9
categoria doc: Getting_Started
8 in A5 is last in column
8 in D4 is last in row/box
Passo 16
Naked Pair
valore: 14.2
categoria doc: Naked_Candidates
Naked Pair 3/5 on cells {D5|D6} means
- 3 can be removed from D2
Passo 17
Pointing Pairs
valore: 41.7
categoria doc: Intersection_Removal
Pair: between Box 5 and Row E:
- 1 can be removed from E1
- 1 can be removed from E3
Passo 18
Line/Unit Reduction
valore: 53.4
categoria doc: Intersection_Removal
Line/Box Reduction: 4s in box 5 remove the following in the same box:
- 4 can be removed from E4
- 4 can be removed from E6
- 4 can be removed from F4
- 4 can be removed from F6
Passo 19
3D Medusa
valore: 211.3
categoria doc: 3D_Medusa
(RULE 5): Uncoloured candidate 7 in F6 can see coloured 7 elsewhere and an oppositely coloured 6 in its own cell. It can be removed.
Passo 20
Naked Triple
valore: 52.3
categoria doc: Naked_Candidates
Naked Triple 4/6/9 on cells {E5|F5|F6} means
- 9 can be removed from E6
Passo 21
Y-Wing
valore: 103.4
categoria doc: Y_Wing_Strategy
Y-Wing pattern. Hinge: H6 (1/4), wings E6 H7, therefore
- 7 can be removed from E7
Passo 22
Hidden Singles
valore: 2.5
categoria doc: Getting_Started
7 in F8 is last in box
7 in H7 is last in column
Passo 23
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 2 in F4 changed to solution
Passo 24
Hidden Singles
valore: 2.3
categoria doc: Getting_Started
9 in D8 is last in column/box
Passo 25
WXYZ Wing
valore: 214.6
categoria doc: WXYZ_Wing
WXYZ Wing Type 2: The four cells {E3,F3,F2,C3} contain in total 2/3/4/9.
Hinge cells (orange) contains WXYZ and 'wing' cells (in yellow) contain WY and XZ respectively. Therefore...
9 can be taken off B3 (Col)
4 can be taken off D2 (Box)
Last candidate 1 in D2 changed to solution
Passo 26
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 6 in D1 changed to solution
Passo 27
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 4 in D7 changed to solution
Passo 28
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 6 in E7 changed to solution
Passo 29
XY-Chain
valore: 118
categoria doc: XY_Chains
length=4, chain ends: E5 and F2
This proves 4 is the solution at one or possibly both ends of the chain
-4[E5]+9[E5]-9[E1]+2[E1]-2[G1]+2[G2]-4[G2]+4[F2]
- 4 can be removed from E3
- 4 can be removed from F5
Passo 30
Hidden Singles
valore: 1.8
categoria doc: Getting_Started
4 in E5 is last in row/column/box
Passo 31
Naked Pair
valore: 8.7
categoria doc: Naked_Candidates
Naked Pair 2/9 on cells {C3|E3} means
- 9 can be removed from F3
Passo 32
Bi-value Universal Grave
valore: 50.3
categoria doc: BUG
BUG+1 found in A6, 7 must be the solution
All other incomplete cells contain two candidates apart from A6. Other candidates in A6 would lead to zero, two or more solutions so they can be removed.
Last candidate 7 in A6 changed to solution
Passo 33
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 5 in A2 changed to solution
Last candidate 4 in A4 changed to solution
Last candidate 9 in C6 changed to solution
Last candidate 1 in E6 changed to solution
Passo 34
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 3 in B2 changed to solution
Last candidate 5 in B5 changed to solution
Last candidate 2 in C3 changed to solution
Last candidate 7 in E4 changed to solution
Last candidate 6 in F6 changed to solution
Last candidate 4 in H6 changed to solution
Last candidate 1 in J4 changed to solution
Passo 35
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 1 in B3 changed to solution
Last candidate 7 in C2 changed to solution
Last candidate 3 in D5 changed to solution
Last candidate 9 in E3 changed to solution
Last candidate 4 in F2 changed to solution
Last candidate 9 in F5 changed to solution
Last candidate 1 in H8 changed to solution
Last candidate 4 in J3 changed to solution
Last candidate 3 in J6 changed to solution
Passo 36
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 9 in A1 changed to solution
Last candidate 9 in B7 changed to solution
Last candidate 5 in D6 changed to solution
Last candidate 2 in E1 changed to solution
Last candidate 3 in F3 changed to solution
Last candidate 2 in G2 changed to solution
Last candidate 4 in G8 changed to solution
Last candidate 6 in J5 changed to solution
Passo 37
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 1 in A7 changed to solution
Last candidate 1 in G1 changed to solution