Passi risolutivi (40)
Passo 1
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 7 in D2 changed to solution
Last candidate 1 in E4 changed to solution
Passo 2
Naked Singles
valore: 2.4
categoria doc: Getting_Started
Last candidate 3 in D4 changed to solution
Passo 3
Naked Singles
valore: 2.3
categoria doc: Getting_Started
Last candidate 4 in B4 changed to solution
Passo 4
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 7 in B1 changed to solution
Passo 5
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 3 in B3 changed to solution
Passo 6
Hidden Singles
valore: 4
categoria doc: Getting_Started
3 in C8 is last in column
3 in J7 is last in row/box
4 in J6 is last in column/box
9 in J3 is last in row/column/box
Passo 7
Hidden Singles
valore: 3.7
categoria doc: Getting_Started
3 in A5 is last in row/column/box
8 in J4 is last in row
Passo 8
Naked Pair
valore: 17.1
categoria doc: Naked_Candidates
Naked Pair 1/4 on cells {D8|F8} means
- 1/4 can be removed from D7
- 1/4 can be removed from D9
- 1/4 can be removed from F7
Passo 9
Naked Pair
valore: 16.2
categoria doc: Naked_Candidates
Naked Pair 2/6 on cells {D7|D9} means
- 2/6 can be removed from D3
- 2/6 can be removed from E7
- 2/6 can be removed from E9
Passo 10
Naked Pair
valore: 16
categoria doc: Naked_Candidates
Naked Pair 7/9 on cells {E6|F6} means
- 9 can be removed from C6
- 7 can be removed from H6
Passo 11
Hidden Pair
valore: 31.6
categoria doc: Hidden_Candidates
Hidden Pair 2/6 in Box 4, on cells {E1|E3}
- removes 8 from E3
Passo 12
Hidden Pair
valore: 31.4
categoria doc: Hidden_Candidates
Hidden Pair 7/9 in Row F, on cells {F6|F7}
- removes 8 from F7
Passo 13
Hidden Pair
valore: 30.8
categoria doc: Hidden_Candidates
Hidden Pair 8/9 in Col 9, on cells {C9|E9}
- removes 4/6 from C9
Passo 14
Unique Rectangle Type 1
valore: 60.5
categoria doc: Unique_Rectangle
Uniqueness Type 1 removing 1/4 at F3 because of D3,D8,F8
Passo 15
Naked Pair
valore: 15
categoria doc: Naked_Candidates
Naked Pair 5/8 on cells {F2|F3} means
- 5 can be removed from F1
Passo 16
Unique Rectangle Type 1
valore: 58.9
categoria doc: Unique_Rectangle
Uniqueness Type 1 removing 7/9 at E7 because of E6,F6,F7
Last candidate 8 in E7 changed to solution
Passo 17
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 9 in E9 changed to solution
Passo 18
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 8 in C9 changed to solution
Last candidate 7 in E6 changed to solution
Last candidate 7 in F7 changed to solution
Passo 19
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 9 in F6 changed to solution
Passo 20
Unique Rectangle Type 1
valore: 51.2
categoria doc: Unique_Rectangle
Uniqueness Type 1 removing 5/8 at G3 because of F3,F2,G2
Passo 21
Hidden Singles
valore: 2.5
categoria doc: Getting_Started
8 in F3 is last in column
8 in G2 is last in row/box
Passo 22
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 5 in F2 changed to solution
Passo 23
W-Wing
valore: 59.1
categoria doc: W_Wings
W-Wing (single). Either there is a 2 in C6 or in E3. They are connected through 6 in H6/H3, therefore
- 2 can be removed from C3
Passo 24
Rectangle Elimination
valore: 58.5
categoria doc: Rectangle_Elimination
If +1[H7] then -1[B7] forcing +1[B5] which removes all 1s from box 8, so H7 cannot be 1
Passo 25
3D Medusa
valore: 184.9
categoria doc: 3D_Medusa
(RULE 5): Uncoloured candidate 5 in H3 can see coloured 5 elsewhere and an oppositely coloured 6 in its own cell. It can be removed.
Passo 26
Pointing Pairs
valore: 34.3
categoria doc: Intersection_Removal
Pair: between Box 7 and Col 1:
- 5 can be removed from C1
Passo 27
XY-Chain
valore: 144.8
categoria doc: XY_Chains
length=4, chain ends: A4 and C3
This proves 5 is the solution at one or possibly both ends of the chain
-5[A4]+6[A4]-6[C6]+2[C6]-2[C1]+4[C1]-4[C3]+5[C3]
- 5 can be removed from A3
- 5 can be removed from C5
Passo 28
Hidden Singles
valore: 2.2
categoria doc: Getting_Started
5 in A4 is last in row/box
5 in C3 is last in row/column/box
Passo 29
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 6 in G4 changed to solution
Passo 30
Hidden Singles
valore: 1.9
categoria doc: Getting_Started
6 in E1 is last in column
6 in H3 is last in row/box
Passo 31
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 2 in E3 changed to solution
Passo 32
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 4 in A3 changed to solution
Passo 33
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 2 in C1 changed to solution
Last candidate 1 in D3 changed to solution
Passo 34
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 9 in C5 changed to solution
Last candidate 6 in C6 changed to solution
Last candidate 4 in D8 changed to solution
Last candidate 4 in F1 changed to solution
Last candidate 7 in G3 changed to solution
Passo 35
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 1 in B5 changed to solution
Last candidate 4 in C7 changed to solution
Last candidate 1 in F8 changed to solution
Passo 36
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 2 in A6 changed to solution
Last candidate 9 in B7 changed to solution
Last candidate 5 in J5 changed to solution
Passo 37
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 2 in G5 changed to solution
Last candidate 1 in H6 changed to solution
Last candidate 1 in J1 changed to solution
Passo 38
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 5 in G1 changed to solution
Last candidate 7 in H5 changed to solution
Last candidate 2 in H9 changed to solution
Passo 39
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 6 in D9 changed to solution
Last candidate 1 in G7 changed to solution
Last candidate 5 in H7 changed to solution
Passo 40
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 6 in A7 changed to solution
Last candidate 1 in A9 changed to solution
Last candidate 2 in D7 changed to solution
Last candidate 4 in G9 changed to solution