Passi risolutivi (29)
Passo 1
Hidden Singles
valore: 6.1
categoria doc: Getting_Started
1 in C6 is last in row/box
1 in F9 is last in row/column/box
2 in J5 is last in row/box
Passo 2
Hidden Singles
valore: 5.6
categoria doc: Getting_Started
1 in G5 is last in column/box
1 in J1 is last in row
2 in B9 is last in row
Passo 3
Hidden Singles
valore: 5.3
categoria doc: Getting_Started
1 in D2 is last in row/column/box
Passo 4
Hidden Singles
valore: 5.2
categoria doc: Getting_Started
2 in C2 is last in column
Passo 5
Hidden Singles
valore: 4.9
categoria doc: Getting_Started
2 in A4 is last in row/column/box
5 in B1 is last in box
5 in E2 is last in column
Passo 6
Hidden Singles
valore: 4.1
categoria doc: Getting_Started
5 in G9 is last in column
8 in A5 is last in row/box
8 in F4 is last in column
Passo 7
Hidden Singles
valore: 3.8
categoria doc: Getting_Started
9 in F6 is last in box
Passo 8
Naked Pair
valore: 17.9
categoria doc: Naked_Candidates
Naked Pair 3/7 on cells {G2|H2} means
- 3/7 can be removed from G3
- 7 can be removed from H1
- 3/7 can be removed from J3
Passo 9
Pointing Pairs
valore: 53.2
categoria doc: Intersection_Removal
Pair: between Box 2 and Row B:
- 4 can be removed from B8
Last candidate 6 in B8 changed to solution
Passo 10
Hidden Singles
valore: 3.3
categoria doc: Getting_Started
6 in C4 is last in box
Passo 11
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 2 in D3 changed to solution
Passo 12
Hidden Singles
valore: 2.8
categoria doc: Getting_Started
2 in F7 is last in row/column/box
Passo 13
Naked Pair
valore: 13.2
categoria doc: Naked_Candidates
Naked Pair 7/9 on cells {G4|H4} means
- 7 can be removed from G6
- 7 can be removed from H5
- 7 can be removed from J6
Passo 14
Hidden Singles
valore: 2.6
categoria doc: Getting_Started
7 in B6 is last in column
Passo 15
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 4 in B5 changed to solution
Passo 16
Hidden Singles
valore: 2.4
categoria doc: Getting_Started
4 in G6 is last in column/box
4 in H9 is last in row
Passo 17
Hidden Singles
valore: 2.1
categoria doc: Getting_Started
4 in A7 is last in row/box
Passo 18
Line/Unit Reduction
valore: 41.3
categoria doc: Intersection_Removal
Line/Box Reduction: 7s in box 9 remove the following in the same box:
- 7 can be removed from G7
Passo 19
Rectangle Elimination
valore: 50.9
categoria doc: Rectangle_Elimination
If +6[D7] then -6[D6] forcing +6[J6] which removes all 6s from box 9, so D7 cannot be 6
Passo 20
Pointing Pairs
valore: 30.1
categoria doc: Intersection_Removal
Pair: between Box 6 and Row E:
- 6 can be removed from E5
Passo 21
XY-Chain
valore: 128.7
categoria doc: XY_Chains
length=4, chain ends: A9 and F3
This proves 7 is the solution at one or possibly both ends of the chain
-7[A9]+3[A9]-3[C8]+5[C8]-5[F8]+4[F8]-4[F3]+7[F3]
- 7 can be removed from A3
Passo 22
XY-Chain
valore: 166
categoria doc: XY_Chains
length=6, chain ends: D7 and H5
This proves 3 is the solution at one or possibly both ends of the chain
-3[D7]+5[D7]-5[F8]+4[F8]-4[F3]+7[F3]-7[E1]+9[E1]-9[H1]+6[H1]-6[H5]+3[H5]
- 3 can be removed from D5
Passo 23
Simple Colouring
valore: 96.3
categoria doc: Singles_Chains
(RULE 4): Uncoloured candidate 3 in G7 can see two different coloured candidates of 3 elsewhere.
Passo 24
XY-Chain
valore: 180.3
categoria doc: XY_Chains
length=7, chain ends: A3 and G7
This proves 6 is the solution at one or possibly both ends of the chain
-6[A3]+3[A3]-3[C3]+7[C3]-7[F3]+4[F3]-4[F8]+5[F8]-5[C8]+3[C8]-3[G8]+8[G8]-8[G7]+6[G7]
- 6 can be removed from G3
Passo 25
Hidden Singles
valore: 1.9
categoria doc: Getting_Started
6 in G7 is last in row
Passo 26
Hidden Singles
valore: 1.7
categoria doc: Getting_Started
6 in E9 is last in row/column/box
Passo 27
XY-Chain
valore: 123.8
categoria doc: XY_Chains
length=5, chain ends: A9 and G8
This proves 3 is the solution at one or possibly both ends of the chain
-3[A9]+7[A9]-7[A1]+6[A1]-6[H1]+9[H1]-9[G3]+8[G3]-8[G8]+3[G8]
- 3 can be removed from C8
- 3 can be removed from J9
Last candidate 5 in C8 changed to solution
Last candidate 4 in F8 changed to solution
Last candidate 7 in J9 changed to solution
Passo 28
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 3 in A9 changed to solution
Last candidate 7 in C7 changed to solution
Last candidate 7 in F3 changed to solution
Last candidate 5 in F5 changed to solution
Last candidate 6 in A3 changed to solution
Last candidate 3 in C3 changed to solution
Last candidate 6 in D5 changed to solution
Last candidate 3 in D6 changed to solution
Last candidate 5 in D7 changed to solution
Last candidate 9 in E1 changed to solution
Last candidate 4 in E3 changed to solution
Last candidate 7 in E5 changed to solution
Last candidate 6 in H1 changed to solution
Last candidate 3 in H5 changed to solution
Last candidate 8 in J3 changed to solution
Last candidate 6 in J6 changed to solution
Last candidate 3 in J7 changed to solution
Passo 29
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 7 in A1 changed to solution
Last candidate 8 in E7 changed to solution
Last candidate 3 in E8 changed to solution
Last candidate 9 in G3 changed to solution
Last candidate 7 in G4 changed to solution
Last candidate 8 in G8 changed to solution
Last candidate 7 in H2 changed to solution
Last candidate 9 in H4 changed to solution
Last candidate 3 in G2 changed to solution