Passi risolutivi (37)
Passo 1
Hidden Singles
valore: 5.6
categoria doc: Getting_Started
1 in E1 is last in column/box
2 in G1 is last in row/box
9 in B3 is last in box
9 in C9 is last in row
9 in H2 is last in column
Passo 2
Hidden Singles
valore: 4.9
categoria doc: Getting_Started
4 in B1 is last in row/box
7 in D1 is last in column/box
9 in D5 is last in row
9 in E7 is last in column/box
Passo 3
Naked Singles
valore: 2.3
categoria doc: Getting_Started
Last candidate 7 in E5 changed to solution
Passo 4
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 1 in F5 changed to solution
Passo 5
Hidden Singles
valore: 4.3
categoria doc: Getting_Started
5 in B5 is last in row
Passo 6
Pointing Pairs
valore: 62.3
categoria doc: Intersection_Removal
Pair: between Box 1 and Row A:
- 2 can be removed from A6
- 2 can be removed from A7
- 2 can be removed from A9
Passo 7
Pointing Pairs
valore: 61.9
categoria doc: Intersection_Removal
Pair: between Box 3 and Row B:
- 2 can be removed from B4
Passo 8
Pointing Pairs
valore: 61.1
categoria doc: Intersection_Removal
Pair: between Box 4 and Col 3:
- 8 can be removed from H3
- 8 can be removed from J3
Passo 9
Line/Unit Reduction
valore: 79.8
categoria doc: Intersection_Removal
Line/Box Reduction: 3s in box 3 remove the following in the same box:
- 3 can be removed from A7
- 3 can be removed from A8
- 3 can be removed from A9
Passo 10
Rectangle Elimination
valore: 99
categoria doc: Rectangle_Elimination
If +1[B9] then -1[B4] forcing +1[J4] which removes all 1s from Box 9, so B9 cannot be 1
Passo 11
XY-Chain
valore: 293
categoria doc: XY_Chains
length=5, chain ends: C6 and F4
This proves 2 is the solution at one or possibly both ends of the chain
-2[C6]+3[C6]-3[A6]+1[A6]-1[B4]+6[B4]-6[G4]+4[G4]-4[F4]+2[F4]
- 2 can be removed from C4
- 2 can be removed from D6
Last candidate 4 in D6 changed to solution
Passo 12
Naked Singles
valore: 1.7
categoria doc: Getting_Started
Last candidate 8 in D8 changed to solution
Last candidate 2 in F4 changed to solution
Passo 13
Hidden Singles
valore: 3.2
categoria doc: Getting_Started
2 in B7 is last in column
2 in C6 is last in row/column/box
8 in A9 is last in row/column/box
8 in E3 is last in row/column/box
Passo 14
Pointing Pairs
valore: 45.4
categoria doc: Intersection_Removal
Pair: between Box 3 and Col 8:
- 1 can be removed from J8
Passo 15
Pointing Pairs
valore: 45
categoria doc: Intersection_Removal
Pair: between Box 4 and Col 2:
- 4 can be removed from J2
Passo 16
Line/Unit Reduction
valore: 57.8
categoria doc: Intersection_Removal
Line/Box Reduction: 3s in box 9 remove the following in the same box:
- 3 can be removed from G9
- 3 can be removed from H9
- 3 can be removed from J8
- 3 can be removed from J9
Passo 17
Line/Unit Reduction
valore: 56.7
categoria doc: Intersection_Removal
Line/Box Reduction: 3s in box 8 remove the following in the same box:
- 3 can be removed from H5
- 3 can be removed from H6
Passo 18
3D Medusa
valore: 224.5
categoria doc: 3D_Medusa
(RULE 4): Uncoloured candidate 6 in G9 can see two different coloured candidates of 6 elsewhere.
Passo 19
Line/Unit Reduction
valore: 55
categoria doc: Intersection_Removal
Line/Box Reduction: 6s in box 8 remove the following in the same box:
- 6 can be removed from H5
- 6 can be removed from J4
Last candidate 8 in H5 changed to solution
Passo 20
Hidden Singles
valore: 2.5
categoria doc: Getting_Started
8 in C4 is last in row/column/box
8 in J1 is last in row/column/box
Passo 21
XYZ Wing
valore: 146.9
categoria doc: XYZ_Wing
XYZ-Wing pattern. Hinge: F9 (4/5/7), wings F7 G9, therefore
- 5 can be removed from D9
Last candidate 2 in D9 changed to solution
Passo 22
Hidden Singles
valore: 2.3
categoria doc: Getting_Started
2 in A3 is last in column
2 in E2 is last in row/box
Passo 23
Hidden Singles
valore: 2.1
categoria doc: Getting_Started
4 in F2 is last in column/box
Passo 24
Y-Wing
valore: 82.5
categoria doc: Y_Wing_Strategy
Y-Wing pattern. Hinge: G9 (4/5), wings F9 J8, therefore
- 7 can be removed from J9
Passo 25
Hidden Singles
valore: 2
categoria doc: Getting_Started
7 in F9 is last in column
Passo 26
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 5 in F7 changed to solution
Passo 27
XY-Chain
valore: 159
categoria doc: XY_Chains
length=6, chain ends: C1 and H7
This proves 3 is the solution at one or possibly both ends of the chain
-3[C1]+6[C1]-6[C5]+3[C5]-3[A6]+1[A6]-1[A8]+7[A8]-7[A7]+6[A7]-6[H7]+3[H7]
- 3 can be removed from H1
Passo 28
Hidden Singles
valore: 1.8
categoria doc: Getting_Started
3 in H7 is last in row
3 in J2 is last in box
Passo 29
XY-Chain
valore: 107.3
categoria doc: XY_Chains
length=4, chain ends: H1 and C5
This proves 6 is the solution at one or possibly both ends of the chain
-6[H1]+5[H1]-5[H6]+1[H6]-1[J4]+1[B4]-6[B4]+6[C5]
- 6 can be removed from C1
Last candidate 3 in C1 changed to solution
Passo 30
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 6 in C5 changed to solution
Passo 31
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 1 in B4 changed to solution
Last candidate 3 in G5 changed to solution
Passo 32
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 3 in A6 changed to solution
Last candidate 3 in B8 changed to solution
Last candidate 5 in G6 changed to solution
Last candidate 4 in J4 changed to solution
Passo 33
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 6 in B9 changed to solution
Last candidate 4 in E8 changed to solution
Last candidate 6 in G4 changed to solution
Last candidate 4 in G9 changed to solution
Last candidate 1 in H6 changed to solution
Last candidate 7 in J8 changed to solution
Passo 34
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 7 in A7 changed to solution
Last candidate 1 in A8 changed to solution
Last candidate 3 in E9 changed to solution
Last candidate 5 in H9 changed to solution
Last candidate 6 in J7 changed to solution
Passo 35
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 6 in H1 changed to solution
Last candidate 5 in J3 changed to solution
Last candidate 1 in J9 changed to solution
Passo 36
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 5 in A1 changed to solution
Last candidate 6 in D3 changed to solution
Last candidate 4 in H3 changed to solution
Passo 37
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 6 in A2 changed to solution
Last candidate 5 in D2 changed to solution