Passi risolutivi (30)
Passo 1
Naked Singles
valore: 2
categoria doc: Getting_Started
Last candidate 9 in B7 changed to solution
Last candidate 1 in E7 changed to solution
Passo 2
Naked Singles
valore: 3
categoria doc: Getting_Started
Last candidate 7 in B2 changed to solution
Last candidate 2 in D7 changed to solution
Last candidate 5 in E3 changed to solution
Passo 3
Naked Singles
valore: 2.3
categoria doc: Getting_Started
Last candidate 3 in F7 changed to solution
Passo 4
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 6 in C7 changed to solution
Last candidate 7 in J7 changed to solution
Passo 5
Hidden Singles
valore: 4.2
categoria doc: Getting_Started
3 in C2 is last in row
4 in B9 is last in row
7 in A5 is last in column
Passo 6
Hidden Singles
valore: 3.8
categoria doc: Getting_Started
1 in C5 is last in column
5 in B1 is last in row
Passo 7
Naked Pair
valore: 17.9
categoria doc: Naked_Candidates
Naked Pair 3/5 on cells {A8|A9} means
- 5 can be removed from A4
- 5 can be removed from A6
Passo 8
Naked Pair
valore: 17.2
categoria doc: Naked_Candidates
Naked Pair 8/9 on cells {C1|H1} means
- 9 can be removed from A1
- 9 can be removed from D1
- 9 can be removed from F1
- 8/9 can be removed from J1
Passo 9
Pointing Pairs
valore: 50.8
categoria doc: Intersection_Removal
Pair: between Box 2 and Col 4:
- 9 can be removed from G4
- 9 can be removed from J4
Passo 10
Rectangle Elimination
valore: 83.9
categoria doc: Rectangle_Elimination
If +8[H5] then -8[B5] forcing +8[B3] which removes all 8s from Box 7, so H5 cannot be 8
Passo 11
XYZ Wing
valore: 199.7
categoria doc: XYZ_Wing
XYZ-Wing pattern. Hinge: D1 (1/4/6), wings E2 J1, therefore
- 4 can be removed from F1
Passo 12
X-Cycle
valore: 247.6
categoria doc: X_Cycles
X-CYCLE on 8 (Discontinuous Alternating Nice Loop, length 8):
+8[H8]-8[H1]+8[C1]-8[B3]+8[B5]-8[E5]+8[E8]-8[H8]
- Contradiction: When H8 is set to 8 the chain implies it cannot be 8 - it can be removed
Passo 13
3D Medusa
valore: 261.9
categoria doc: 3D_Medusa
(RULE 4): Uncoloured candidate 8 in G8 can see two different coloured candidates of 8 elsewhere.
Passo 14
3D Medusa
valore: 255.3
categoria doc: 3D_Medusa
(RULE 5): Uncoloured candidate 4 in D4 can see coloured 4 elsewhere and an oppositely coloured 6 in its own cell. It can be removed.
(RULE 5): Uncoloured candidate 8 in H9 can see coloured 8 elsewhere and an oppositely coloured 6 in its own cell. It can be removed.
(RULE 5): Uncoloured candidate 9 in G9 can see coloured 9 elsewhere and an oppositely coloured 6 in its own cell. It can be removed.
Passo 15
Line/Unit Reduction
valore: 63.3
categoria doc: Intersection_Removal
Line/Box Reduction: 8s in box 7 remove the following in the same box:
- 8 can be removed from G3
Passo 16
Unique Rectangle 2+
valore: 155.4
categoria doc: Unique_Rectangles
Uniqueness Type 5: removing 8 from C6 and J4 because if true it would create a Deadly Rectangle with C4 and J4
Last candidate 5 in C6 changed to solution
Last candidate 5 in J4 changed to solution
Passo 17
Chute Remote Pair
valore: 73.6
categoria doc: Chute_Remote_Pairs
8 cannot be set in the yellow cells {A6,B6,C6} and with the Remote Pair in E5 and G4 it means:
- 6 can be removed from D4
- 6 can be removed from H5
Last candidate 1 in D4 changed to solution
Passo 18
Hidden Singles
valore: 2.7
categoria doc: Getting_Started
6 in D1 is last in row
6 in E5 is last in column/box
6 in G4 is last in column/box
6 in H9 is last in row
Passo 19
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 4 in E2 changed to solution
Passo 20
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 8 in E8 changed to solution
Passo 21
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 9 in F9 changed to solution
Passo 22
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 5 in D9 changed to solution
Last candidate 1 in F2 changed to solution
Passo 23
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 3 in A9 changed to solution
Last candidate 4 in D8 changed to solution
Last candidate 2 in F1 changed to solution
Last candidate 9 in J2 changed to solution
Passo 24
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 1 in A1 changed to solution
Last candidate 6 in A2 changed to solution
Last candidate 5 in A8 changed to solution
Last candidate 7 in D6 changed to solution
Last candidate 7 in F3 changed to solution
Last candidate 8 in H1 changed to solution
Passo 25
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 9 in C1 changed to solution
Last candidate 9 in D3 changed to solution
Last candidate 3 in H3 changed to solution
Last candidate 4 in J1 changed to solution
Passo 26
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 2 in A3 changed to solution
Last candidate 8 in C4 changed to solution
Last candidate 1 in G3 changed to solution
Passo 27
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 4 in A6 changed to solution
Last candidate 8 in B3 changed to solution
Last candidate 2 in B5 changed to solution
Last candidate 4 in F4 changed to solution
Last candidate 8 in G9 changed to solution
Passo 28
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 9 in A4 changed to solution
Last candidate 8 in F6 changed to solution
Last candidate 3 in G6 changed to solution
Last candidate 9 in H5 changed to solution
Last candidate 8 in J5 changed to solution
Last candidate 1 in J9 changed to solution
Passo 29
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 9 in G8 changed to solution
Last candidate 2 in H8 changed to solution
Last candidate 2 in J6 changed to solution
Passo 30
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 3 in J8 changed to solution