Passi risolutivi (37)
Passo 1
Hidden Singles
valore: 5.7
categoria doc: Getting_Started
5 in B5 is last in box
6 in A1 is last in column/box
6 in F6 is last in column
6 in H5 is last in row/box
8 in E9 is last in box
Passo 2
Naked Singles
valore: 2
categoria doc: Getting_Started
Last candidate 1 in E5 changed to solution
Last candidate 3 in F5 changed to solution
Passo 3
Naked Singles
valore: 2.4
categoria doc: Getting_Started
Last candidate 8 in D5 changed to solution
Passo 4
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 7 in C5 changed to solution
Last candidate 9 in D6 changed to solution
Passo 5
Naked Singles
valore: 2
categoria doc: Getting_Started
Last candidate 1 in A6 changed to solution
Last candidate 8 in C6 changed to solution
Last candidate 4 in G5 changed to solution
Passo 6
Naked Singles
valore: 2
categoria doc: Getting_Started
Last candidate 9 in C4 changed to solution
Last candidate 7 in G6 changed to solution
Passo 7
Hidden Singles
valore: 3.7
categoria doc: Getting_Started
1 in D3 is last in row/box
6 in C8 is last in column
6 in E7 is last in row/box
Passo 8
Naked Pair
valore: 17.5
categoria doc: Naked_Candidates
Naked Pair 5/9 on cells {E1|E3} means
- 5 can be removed from D1
- 5/9 can be removed from F3
Passo 9
Naked Pair
valore: 16.9
categoria doc: Naked_Candidates
Naked Pair 4/9 on cells {F9|H9} means
- 9 can be removed from A9
- 4/9 can be removed from B9
- 4 can be removed from J9
Last candidate 7 in A9 changed to solution
Passo 10
Hidden Singles
valore: 3
categoria doc: Getting_Started
7 in B3 is last in row/column/box
7 in J7 is last in row/column/box
Passo 11
Hidden Singles
valore: 2.9
categoria doc: Getting_Started
8 in B2 is last in row/box
Passo 12
Hidden Pair
valore: 27
categoria doc: Hidden_Candidates
Hidden Pair 1/2 in Box 9, on cells {G7|J9}
- removes 3/5/9 from G7
Passo 13
Pointing Pairs
valore: 39.6
categoria doc: Intersection_Removal
Pair: between Box 1 and Col 3:
- 3 can be removed from G3
- 3 can be removed from H3
Passo 14
Pointing Pairs
valore: 39.2
categoria doc: Intersection_Removal
Pair: between Box 6 and Col 7:
- 5 can be removed from H7
Passo 15
Line/Unit Reduction
valore: 51.2
categoria doc: Intersection_Removal
Line/Box Reduction: 3s in box 9 remove the following in the same box:
- 3 can be removed from G8
- 3 can be removed from J8
Passo 16
Rectangle Elimination
valore: 63.3
categoria doc: Rectangle_Elimination
If +4[B1] then -4[D1] forcing +4[D7] which removes all 4s from Box 3, so B1 cannot be 4
Passo 17
Pointing Pairs
valore: 37.6
categoria doc: Intersection_Removal
Pair: between Box 1 and Row C:
- 4 can be removed from C7
Passo 18
Hidden Unique Rectangle
valore: 247.6
categoria doc: Hidden_Unique_Rectangles
Type 2: removing 9 at G3 because of EG13 and one strong link on 5 between E1 and G1
Passo 19
Hidden Unique Rectangle
valore: 244.8
categoria doc: Hidden_Unique_Rectangles
Type 2b: removing 4 at H7 because of FH79 and one strong link on 9 between F9 and F7
Passo 20
XY-Chain
valore: 157.4
categoria doc: XY_Chains
length=4, chain ends: C2 and H9
This proves 4 is the solution at one or possibly both ends of the chain
-4[C2]+2[C2]-2[C7]+3[C7]-3[H7]+9[H7]-9[H9]+4[H9]
- 4 can be removed from H2
Passo 21
Naked Pair
valore: 11.8
categoria doc: Naked_Candidates
Naked Pair 5/9 on cells {A2|H2} means
- 5/9 can be removed from G2
Passo 22
Naked Pair
valore: 11.6
categoria doc: Naked_Candidates
Naked Pair 1/2 on cells {G2|G7} means
- 2 can be removed from G1
- 2 can be removed from G3
Passo 23
Chute Remote Pair
valore: 57.1
categoria doc: Chute_Remote_Pairs
5 cannot be set in the yellow cells {A1,B1,C1} and with the Remote Pair in E3 and H2 it means:
- 9 can be removed from H3
Passo 24
W-Wing
valore: 55.7
categoria doc: W_Wings
W-Wing (single). Either there is a 3 in A8 or in H7. They are connected through 9 in A2/H2, therefore
- 3 can be removed from C7
- 3 can be removed from H8
Last candidate 2 in C7 changed to solution
Passo 25
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 1 in B9 changed to solution
Last candidate 4 in C2 changed to solution
Last candidate 1 in G7 changed to solution
Passo 26
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 3 in C3 changed to solution
Last candidate 2 in G2 changed to solution
Last candidate 2 in J9 changed to solution
Passo 27
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 1 in J2 changed to solution
Passo 28
Hidden Singles
valore: 1.5
categoria doc: Getting_Started
2 in B1 is last in row/box
2 in F3 is last in column
3 in A8 is last in row/column/box
3 in H7 is last in row/column/box
Passo 29
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 4 in D1 changed to solution
Last candidate 5 in F4 changed to solution
Passo 30
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 2 in D4 changed to solution
Last candidate 5 in D7 changed to solution
Last candidate 3 in J1 changed to solution
Passo 31
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 8 in J4 changed to solution
Passo 32
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 3 in G4 changed to solution
Last candidate 4 in J8 changed to solution
Passo 33
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 9 in B8 changed to solution
Last candidate 9 in H9 changed to solution
Passo 34
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 4 in B7 changed to solution
Last candidate 4 in F9 changed to solution
Last candidate 5 in H2 changed to solution
Passo 35
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 9 in A2 changed to solution
Last candidate 9 in F7 changed to solution
Last candidate 9 in G1 changed to solution
Last candidate 8 in G3 changed to solution
Last candidate 8 in H8 changed to solution
Passo 36
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 5 in A3 changed to solution
Last candidate 5 in E1 changed to solution
Last candidate 5 in G8 changed to solution
Last candidate 4 in H3 changed to solution
Passo 37
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 9 in E3 changed to solution