Passi risolutivi (27)
Passo 1
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 5 in J6 changed to solution
Passo 2
Hidden Singles
valore: 4.5
categoria doc: Getting_Started
3 in A5 is last in column/box
5 in F5 is last in row/box
7 in B8 is last in row/box
7 in D2 is last in row
7 in F6 is last in column/box
9 in B5 is last in column/box
Passo 3
Hidden Singles
valore: 3.9
categoria doc: Getting_Started
1 in B3 is last in row
4 in A7 is last in box
4 in D8 is last in column
Passo 4
Pointing Pairs
valore: 55.3
categoria doc: Intersection_Removal
Pair: between Box 5 and Row D:
- 1 can be removed from D9
Passo 5
Pointing Pairs
valore: 54.9
categoria doc: Intersection_Removal
Pair: between Box 8 and Row H:
- 4 can be removed from H2
Passo 6
X-Cycle
valore: 272.4
categoria doc: X_Cycles
X-CYCLE on 9 (Discontinuous Alternating Nice Loop, length 8):
+9[C3]-9[C2]+9[H2]-9[H9]+9[D9]-9[E7]+9[E3]-9[C3]
- Contradiction: When C3 is set to 9 the chain implies it cannot be 9 - it can be removed
Passo 7
Hidden Unique Rectangle
valore: 360.4
categoria doc: Hidden_Unique_Rectangles
Type 1: removing 6 at E5 because of EH56 and two strong links on 4
Passo 8
WXYZ Wing
valore: 357.6
categoria doc: WXYZ_Wing
WXYZ Wing Type 1: The four cells {D4,A4,B4,D5} contain in total 1/5/6/8 with the hinge on D4.
Non-Restricted candidate 6 determines the 'wing' cells (in yellow) and one of those 6s must be true. Therefore...
- 6 can be removed from E4
Passo 9
Forcing Nets
valore: 354.9
categoria doc: Forcing_Nets
If A3 is not 6 then both candidates in D5 are ON so A3 must be 6
Depth: 19
len: 40
-6[A3]+6[A4]-6[C6]+8[C6]-8[C7]+8[A9]-8[D9]+9[D9]-9[D1]+9[E3]-9[J3]+7[J3]-7[J7]+7[G7]-6[G7]+6[G8]-1[G8]+1[G4]-1[D4]+1[D5]
-6[A3]+6[A4]-6[C6]+8[C6]-8[C7]+8[A9]-8[D9]+9[D9]-9[D1]+9[E3]-9[J3]+7[J3]-7[J7]+7[G7]-6[G7]+6[G8]-6[F8]+6[F1]-6[D1]+6[D5]
Last candidate 6 in A3 changed to solution
Passo 10
Naked Singles
valore: 1.7
categoria doc: Getting_Started
Last candidate 9 in E3 changed to solution
Passo 11
Naked Singles
valore: 1.7
categoria doc: Getting_Started
Last candidate 7 in J3 changed to solution
Passo 12
Hidden Singles
valore: 3.1
categoria doc: Getting_Started
6 in C6 is last in row/box
7 in G7 is last in row/column/box
9 in D9 is last in row/box
Passo 13
Naked Singles
valore: 1.5
categoria doc: Getting_Started
Last candidate 4 in H6 changed to solution
Passo 14
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 8 in E6 changed to solution
Passo 15
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 2 in E4 changed to solution
Last candidate 6 in E7 changed to solution
Passo 16
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 4 in E5 changed to solution
Last candidate 9 in H7 changed to solution
Passo 17
Hidden Singles
valore: 2.3
categoria doc: Getting_Started
6 in F1 is last in row
8 in D1 is last in row
9 in C2 is last in column
9 in J1 is last in row/box
Passo 18
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 4 in B1 changed to solution
Last candidate 3 in F2 changed to solution
Passo 19
Hidden Singles
valore: 1.8
categoria doc: Getting_Started
3 in H9 is last in row
4 in G2 is last in row/column/box
Passo 20
Line/Unit Reduction
valore: 33
categoria doc: Intersection_Removal
Line/Box Reduction: 8s in box 3 remove the following in the same box:
- 8 can be removed from A9
Passo 21
Unique Rectangle Type 1
valore: 31.9
categoria doc: Unique_Rectangle
Uniqueness Type 1 removing 5/8 at A2 because of A4,B4,B2
Last candidate 2 in A2 changed to solution
Passo 22
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 5 in A9 changed to solution
Last candidate 3 in C1 changed to solution
Last candidate 5 in H2 changed to solution
Passo 23
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 8 in A4 changed to solution
Last candidate 8 in B2 changed to solution
Last candidate 5 in C3 changed to solution
Last candidate 2 in G1 changed to solution
Last candidate 3 in G3 changed to solution
Passo 24
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 5 in B4 changed to solution
Last candidate 1 in G9 changed to solution
Passo 25
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 8 in F9 changed to solution
Last candidate 6 in G4 changed to solution
Last candidate 8 in J7 changed to solution
Passo 26
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 1 in C7 changed to solution
Last candidate 2 in C9 changed to solution
Last candidate 1 in D4 changed to solution
Last candidate 1 in F8 changed to solution
Last candidate 5 in G8 changed to solution
Last candidate 2 in H5 changed to solution
Last candidate 2 in J8 changed to solution
Passo 27
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 8 in C8 changed to solution
Last candidate 6 in D5 changed to solution
Last candidate 6 in H8 changed to solution
Last candidate 1 in J5 changed to solution