Passi risolutivi (39)
Passo 1
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 2 in F7 changed to solution
Passo 2
Hidden Singles
valore: 5.9
categoria doc: Getting_Started
2 in C9 is last in row/box
6 in C3 is last in column
Passo 3
Hidden Singles
valore: 5.5
categoria doc: Getting_Started
9 in C1 is last in row/box
Passo 4
Hidden Singles
valore: 5.3
categoria doc: Getting_Started
4 in C7 is last in row
Passo 5
Hidden Singles
valore: 5.1
categoria doc: Getting_Started
3 in G7 is last in column
Passo 6
Naked Singles
valore: 2.3
categoria doc: Getting_Started
Last candidate 9 in J9 changed to solution
Passo 7
Naked Singles
valore: 2.3
categoria doc: Getting_Started
Last candidate 2 in J8 changed to solution
Passo 8
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 8 in J2 changed to solution
Passo 9
Naked Singles
valore: 2.1
categoria doc: Getting_Started
Last candidate 6 in J1 changed to solution
Passo 10
Naked Singles
valore: 2.1
categoria doc: Getting_Started
Last candidate 3 in J4 changed to solution
Passo 11
Naked Singles
valore: 2
categoria doc: Getting_Started
Last candidate 1 in C4 changed to solution
Passo 12
Naked Singles
valore: 1.8
categoria doc: Getting_Started
Last candidate 7 in F4 changed to solution
Passo 13
Naked Singles
valore: 1.8
categoria doc: Getting_Started
Last candidate 6 in B4 changed to solution
Passo 14
Naked Singles
valore: 1.7
categoria doc: Getting_Started
Last candidate 2 in E4 changed to solution
Passo 15
Hidden Singles
valore: 3.2
categoria doc: Getting_Started
3 in F1 is last in row
6 in A9 is last in row/box
7 in A6 is last in box
Passo 16
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 8 in A8 changed to solution
Passo 17
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 4 in A1 changed to solution
Last candidate 7 in B8 changed to solution
Passo 18
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 3 in A2 changed to solution
Last candidate 3 in B9 changed to solution
Passo 19
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 5 in B2 changed to solution
Passo 20
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 8 in B1 changed to solution
Passo 21
Naked Pair
valore: 10.7
categoria doc: Naked_Candidates
Naked Pair 5/6 on cells {D7|E7} means
- 5 can be removed from D9
- 5 can be removed from E9
Passo 22
Line/Unit Reduction
valore: 41.3
categoria doc: Intersection_Removal
Line/Box Reduction: 1s in box 6 remove the following in the same box:
- 1 can be removed from D9
- 1 can be removed from E8
- 1 can be removed from E9
Passo 23
Naked Pair
valore: 10
categoria doc: Naked_Candidates
Naked Pair 4/9 on cells {E2|E8} means
- 9 can be removed from E3
- 4 can be removed from E9
Passo 24
Y-Wing
valore: 79.2
categoria doc: Y_Wing_Strategy
Y-Wing pattern. Hinge: D9 (4/7), wings D3 G9, therefore
- 5 can be removed from G3
Passo 25
Pointing Pairs
valore: 28.9
categoria doc: Intersection_Removal
Pair: between Box 7 and Col 1:
- 5 can be removed from D1
- 5 can be removed from E1
Passo 26
XYZ Wing
valore: 113.9
categoria doc: XYZ_Wing
XYZ-Wing pattern. Hinge: E3 (5/7/8), wings D3 E9, therefore
- 7 can be removed from E1
Last candidate 1 in E1 changed to solution
Passo 27
Hidden Singles
valore: 1.8
categoria doc: Getting_Started
1 in D6 is last in row/column/box
Passo 28
Hidden Singles
valore: 1.7
categoria doc: Getting_Started
6 in D7 is last in row
Passo 29
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 5 in E7 changed to solution
Passo 30
Hidden Singles
valore: 1.6
categoria doc: Getting_Started
5 in D3 is last in row/column/box
Passo 31
XY-Chain
valore: 98.3
categoria doc: XY_Chains
length=4, chain ends: H2 and G6
This proves 2 is the solution at one or possibly both ends of the chain
-2[H2]+9[H2]-9[G3]+7[G3]-7[G5]+8[G5]-8[G6]+2[G6]
- 2 can be removed from G1
- 2 can be removed from H6
Last candidate 6 in H6 changed to solution
Passo 32
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 3 in E6 changed to solution
Last candidate 7 in H5 changed to solution
Passo 33
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 8 in C6 changed to solution
Last candidate 6 in E5 changed to solution
Last candidate 8 in G5 changed to solution
Passo 34
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 3 in C5 changed to solution
Last candidate 2 in G6 changed to solution
Passo 35
Bi-value Universal Grave
valore: 30.5
categoria doc: BUG
BUG+1 found in H9, 4 must be the solution
All other incomplete cells contain two candidates apart from H9. Other candidates in H9 would lead to zero, two or more solutions so they can be removed.
Last candidate 4 in H9 changed to solution
Passo 36
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 7 in D9 changed to solution
Last candidate 5 in G9 changed to solution
Last candidate 9 in H4 changed to solution
Last candidate 1 in H8 changed to solution
Passo 37
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 2 in D1 changed to solution
Last candidate 8 in E9 changed to solution
Last candidate 9 in F8 changed to solution
Last candidate 7 in G1 changed to solution
Last candidate 4 in G4 changed to solution
Last candidate 2 in H2 changed to solution
Passo 38
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 4 in D2 changed to solution
Last candidate 7 in E3 changed to solution
Last candidate 4 in E8 changed to solution
Last candidate 8 in F3 changed to solution
Last candidate 1 in F9 changed to solution
Last candidate 9 in G3 changed to solution
Last candidate 5 in H1 changed to solution
Passo 39
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 9 in E2 changed to solution