Passi risolutivi (19)
Passo 1
Hidden Singles
valore: 5.3
categoria doc: Getting_Started
5 in D6 is last in column/box
7 in B7 is last in column/box
7 in F2 is last in box
7 in H4 is last in row/box
Passo 2
Hidden Singles
valore: 4.7
categoria doc: Getting_Started
1 in B8 is last in row/box
7 in A1 is last in row/column/box
7 in E5 is last in row/column/box
Passo 3
Hidden Singles
valore: 4.2
categoria doc: Getting_Started
2 in A8 is last in box
5 in A3 is last in row/box
5 in J1 is last in column
Passo 4
Hidden Singles
valore: 3.9
categoria doc: Getting_Started
5 in H9 is last in row/column/box
Passo 5
Hidden Singles
valore: 3.7
categoria doc: Getting_Started
4 in H6 is last in row
4 in J9 is last in column/box
Passo 6
Naked Pair
valore: 17.5
categoria doc: Naked_Candidates
Naked Pair 3/9 on cells {A9|C9} means
- 3 can be removed from G9
Passo 7
Pointing Pairs
valore: 52
categoria doc: Intersection_Removal
Pair: between Box 4 and Row D:
- 4 can be removed from D5
Passo 8
Chute Remote Pair
valore: 85.3
categoria doc: Chute_Remote_Pairs
8 cannot be set in the yellow cells {D4,D5,D6} and with the Remote Pair in E3 and F9 it means:
- 1 can be removed from E7
- 1 can be removed from F3
Passo 9
Hidden Singles
valore: 3.4
categoria doc: Getting_Started
1 in E3 is last in row/column/box
1 in F9 is last in row/box
Passo 10
Hidden Singles
valore: 3.1
categoria doc: Getting_Started
8 in J2 is last in row/box
Passo 11
Pointing Pairs
valore: 43.7
categoria doc: Intersection_Removal
Pair: between Box 7 and Row H:
- 6 can be removed from H7
- 6 can be removed from H8
Passo 12
Pointing Pairs
valore: 42.9
categoria doc: Intersection_Removal
Pair: between Box 1 and Row B:
- 8 can be removed from B4
- 8 can be removed from B6
Passo 13
X-Cycle
valore: 212.5
categoria doc: X_Cycles
X-CYCLE on 3 (Discontinuous Alternating Nice Loop, length 8):
+3[A2]-3[A9]+3[C9]-3[C5]+3[G5]-3[G1]+3[H2]-3[A2]
- Contradiction: When A2 is set to 3 the chain implies it cannot be 3 - it can be removed
Last candidate 6 in A2 changed to solution
Passo 14
Hidden Singles
valore: 2.7
categoria doc: Getting_Started
6 in H3 is last in row/column/box
Passo 15
XY-Chain
valore: 169.9
categoria doc: XY_Chains
length=4, chain ends: D5 and H2
This proves 2 is the solution at one or possibly both ends of the chain
-2[D5]+6[D5]-6[D8]+9[D8]-9[H8]+3[H8]-3[H2]+2[H2]
- 2 can be removed from D2
Last candidate 4 in D2 changed to solution
Passo 16
Naked Pair
valore: 12
categoria doc: Naked_Candidates
Naked Pair 2/3 on cells {B2|B6} means
- 2/3 can be removed from B1
- 2 can be removed from B3
- 2/3 can be removed from B4
Passo 17
X-Wing
valore: 69.3
categoria doc: X_Wing_Strategy
(Row->Col) 3 taken off C4, based on CG15
(Row->Col) 3 taken off C9, based on CG15
(Row->Col) 3 taken off G6, based on CG15
Last candidate 9 in C9 changed to solution
Passo 18
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 3 in A9 changed to solution
Last candidate 2 in C3 changed to solution
Last candidate 8 in F3 changed to solution
Last candidate 8 in A6 changed to solution
Last candidate 3 in B2 changed to solution
Last candidate 9 in B3 changed to solution
Last candidate 4 in B4 changed to solution
Last candidate 2 in B6 changed to solution
Last candidate 4 in C1 changed to solution
Last candidate 6 in C4 changed to solution
Last candidate 3 in C5 changed to solution
Last candidate 2 in D1 changed to solution
Last candidate 6 in D5 changed to solution
Last candidate 9 in D8 changed to solution
Last candidate 3 in E6 changed to solution
Last candidate 2 in F4 changed to solution
Last candidate 4 in F5 changed to solution
Last candidate 3 in G1 changed to solution
Last candidate 2 in G5 changed to solution
Last candidate 2 in H2 changed to solution
Last candidate 9 in H7 changed to solution
Last candidate 3 in H8 changed to solution
Last candidate 3 in J4 changed to solution
Last candidate 6 in J8 changed to solution
Passo 19
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 9 in A4 changed to solution
Last candidate 8 in B1 changed to solution
Last candidate 8 in D7 changed to solution
Last candidate 8 in E4 changed to solution
Last candidate 6 in E7 changed to solution
Last candidate 1 in G7 changed to solution
Last candidate 1 in J6 changed to solution
Last candidate 2 in J7 changed to solution
Last candidate 6 in G6 changed to solution