Passi risolutivi (37)
Passo 1
Hidden Singles
valore: 5.6
categoria doc: Getting_Started
3 in D4 is last in box
3 in E2 is last in row
4 in C7 is last in column/box
4 in F6 is last in box
4 in G3 is last in row/box
Passo 2
Hidden Singles
valore: 5
categoria doc: Getting_Started
1 in H1 is last in box
4 in B4 is last in row/column/box
4 in E1 is last in row/column/box
Passo 3
Naked Pair
valore: 23.9
categoria doc: Naked_Candidates
Naked Pair 1/5 on cells {D5|D9} means
- 5 can be removed from D2
- 1 can be removed from D7
Passo 4
Naked Pair
valore: 23
categoria doc: Naked_Candidates
Naked Pair 5/6 on cells {J1|J3} means
- 5 can be removed from G2
- 6 can be removed from H2
- 5/6 can be removed from J4
- 5/6 can be removed from J5
- 5 can be removed from J6
Last candidate 8 in J4 changed to solution
Passo 5
Hidden Singles
valore: 4.2
categoria doc: Getting_Started
6 in H4 is last in row/box
8 in C6 is last in column
Passo 6
Naked Pair
valore: 19.9
categoria doc: Naked_Candidates
Naked Pair 7/9 on cells {H6|J5} means
- 9 can be removed from G5
- 9 can be removed from G6
- 7/9 can be removed from J6
Last candidate 3 in J6 changed to solution
Passo 7
Pointing Pairs
valore: 57.4
categoria doc: Intersection_Removal
Pair: between Box 5 and Col 5:
- 1 can be removed from A5
- 1 can be removed from C5
- 1 can be removed from G5
Passo 8
Pointing Pairs
valore: 56.5
categoria doc: Intersection_Removal
Pair: between Box 8 and Row G:
- 2 can be removed from G7
- 2 can be removed from G8
Passo 9
Pointing Pairs
valore: 55.3
categoria doc: Intersection_Removal
Triple: between Box 5 and Col 5:
- 5 can be removed from A5
- 5 can be removed from C5
- 5 can be removed from G5
Last candidate 2 in G5 changed to solution
Passo 10
Line/Unit Reduction
valore: 69.9
categoria doc: Intersection_Removal
Line/Box Reduction: 5s in box 1 remove the following in the same box:
- 5 can be removed from A3
- 5 can be removed from B1
- 5 can be removed from C3
Passo 11
X-Wing
valore: 100.7
categoria doc: X_Wing_Strategy
(Row->Col) 9 taken off A5, based on AH69
(Row->Col) 9 taken off A7, based on AH69
(Row->Col) 9 taken off A8, based on AH69
(Row->Col) 9 taken off H2, based on AH69
(Row->Col) 9 taken off H8, based on AH69
Last candidate 8 in H2 changed to solution
Passo 12
Naked Singles
valore: 1.6
categoria doc: Getting_Started
Last candidate 9 in G2 changed to solution
Passo 13
Naked Singles
valore: 1.6
categoria doc: Getting_Started
Last candidate 3 in G7 changed to solution
Passo 14
Naked Singles
valore: 1.5
categoria doc: Getting_Started
Last candidate 8 in G8 changed to solution
Passo 15
Hidden Singles
valore: 2.8
categoria doc: Getting_Started
3 in A8 is last in row/column/box
8 in E9 is last in column/box
8 in F5 is last in row
Passo 16
W-Wing
valore: 66.7
categoria doc: W_Wings
W-Wing (single). Either there is a 6 in A5 or in D7. They are connected through 7 in J5/J7, therefore
- 6 can be removed from A7
Passo 17
Pointing Pairs
valore: 39.6
categoria doc: Intersection_Removal
Pair: between Box 3 and Col 8:
- 6 can be removed from F8
Passo 18
XYZ Wing
valore: 156.8
categoria doc: XYZ_Wing
XYZ-Wing pattern. Hinge: B9 (1/2/5), wings A7 D9, therefore
- 1 can be removed from A9
Passo 19
X-Cycle
valore: 193.9
categoria doc: X_Cycles
X-CYCLE on 7 (Discontinuous Alternating Nice Loop, length 8):
+7[A5]-7[B6]+7[B2]-7[D2]+7[D7]-7[J7]+7[J5]-7[A5]
- Contradiction: When A5 is set to 7 the chain implies it cannot be 7 - it can be removed
Last candidate 6 in A5 changed to solution
Passo 20
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 9 in C5 changed to solution
Passo 21
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 7 in J5 changed to solution
Passo 22
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 9 in H6 changed to solution
Last candidate 9 in J7 changed to solution
Passo 23
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 2 in H9 changed to solution
Passo 24
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 7 in H8 changed to solution
Passo 25
Hidden Singles
valore: 2
categoria doc: Getting_Started
9 in A9 is last in row/column/box
9 in F8 is last in row/column/box
Passo 26
Line/Unit Reduction
valore: 36.9
categoria doc: Intersection_Removal
Line/Box Reduction: 5s in box 2 remove the following in the same box:
- 5 can be removed from B6
- 5 can be removed from C4
Passo 27
Line/Unit Reduction
valore: 36.3
categoria doc: Intersection_Removal
Line/Box Reduction: 5s in box 4 remove the following in the same box:
- 5 can be removed from E3
Passo 28
Chute Remote Pair
valore: 44
categoria doc: Chute_Remote_Pairs
1 cannot be set in the yellow cells {B1,B2,B3} and with the Remote Pair in A7 and C4 it means:
- 2 can be removed from A4
- 2 can be removed from C8
Passo 29
Hidden Singles
valore: 1.7
categoria doc: Getting_Started
2 in C4 is last in column/box
Passo 30
Hidden Singles
valore: 1.7
categoria doc: Getting_Started
1 in C3 is last in row
Passo 31
Naked Pair
valore: 7.8
categoria doc: Naked_Candidates
Naked Pair 2/7 on cells {A3|E3} means
- 2 can be removed from F3
Passo 32
Unique Rectangle Type 1
valore: 30.3
categoria doc: Unique_Rectangle
Uniqueness Type 1 removing 1/5 at A6 because of A4,G4,G6
Last candidate 7 in A6 changed to solution
Passo 33
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 2 in A3 changed to solution
Last candidate 1 in B6 changed to solution
Passo 34
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 5 in A4 changed to solution
Last candidate 1 in A7 changed to solution
Last candidate 6 in B1 changed to solution
Last candidate 5 in B9 changed to solution
Last candidate 7 in E3 changed to solution
Last candidate 5 in G6 changed to solution
Passo 35
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 7 in B2 changed to solution
Last candidate 2 in B8 changed to solution
Last candidate 5 in C2 changed to solution
Last candidate 6 in C8 changed to solution
Last candidate 6 in D2 changed to solution
Last candidate 1 in D9 changed to solution
Last candidate 2 in E7 changed to solution
Last candidate 1 in G4 changed to solution
Last candidate 5 in J1 changed to solution
Passo 36
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 5 in D5 changed to solution
Last candidate 7 in D7 changed to solution
Last candidate 5 in E8 changed to solution
Last candidate 2 in F1 changed to solution
Last candidate 5 in F3 changed to solution
Last candidate 6 in F7 changed to solution
Last candidate 6 in J3 changed to solution
Passo 37
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 1 in E5 changed to solution