Passi risolutivi (37)
Passo 1
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 1 in D2 changed to solution
Passo 2
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 3 in J2 changed to solution
Passo 3
Naked Singles
valore: 2.9
categoria doc: Getting_Started
Last candidate 7 in G2 changed to solution
Passo 4
Naked Singles
valore: 2.9
categoria doc: Getting_Started
Last candidate 2 in A2 changed to solution
Passo 5
Hidden Singles
valore: 5.3
categoria doc: Getting_Started
2 in C7 is last in row/column/box
2 in D5 is last in row/column/box
2 in H1 is last in row/column/box
3 in F7 is last in column/box
Passo 6
Hidden Singles
valore: 4.9
categoria doc: Getting_Started
4 in D4 is last in row/box
5 in C8 is last in row/box
Passo 7
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 9 in D8 changed to solution
Passo 8
Hidden Singles
valore: 4.2
categoria doc: Getting_Started
6 in D3 is last in row
9 in F3 is last in column/box
9 in J9 is last in row/box
Passo 9
Hidden Singles
valore: 3.9
categoria doc: Getting_Started
9 in E4 is last in column
Passo 10
Hidden Singles
valore: 3.8
categoria doc: Getting_Started
3 in G4 is last in column
Passo 11
Naked Pair
valore: 18.3
categoria doc: Naked_Candidates
Naked Pair 5/8 on cells {D7|D9} means
- 5 can be removed from E9
Passo 12
Naked Pair
valore: 17.7
categoria doc: Naked_Candidates
Naked Pair 5/7 on cells {E1|F1} means
- 7 can be removed from A1
- 7 can be removed from B1
- 7 can be removed from C1
- 5 can be removed from J1
Passo 13
Pointing Pairs
valore: 52.4
categoria doc: Intersection_Removal
Pair: between Box 3 and Row B:
- 1 can be removed from B1
- 1 can be removed from B3
Passo 14
Pointing Pairs
valore: 51.6
categoria doc: Intersection_Removal
Pair: between Box 7 and Col 3:
- 4 can be removed from B3
- 4 can be removed from C3
Last candidate 7 in B3 changed to solution
Passo 15
Hidden Singles
valore: 3.2
categoria doc: Getting_Started
7 in C5 is last in row
Passo 16
Rectangle Elimination
valore: 78.4
categoria doc: Rectangle_Elimination
If +1[H9] then -1[E9] forcing +1[E5] which removes all 1s from Box 8, so H9 cannot be 1
Passo 17
Rectangle Elimination
valore: 77.7
categoria doc: Rectangle_Elimination
If +1[J5] then -1[J8] forcing +1[F8] which removes all 1s from Box 5, so J5 cannot be 1
Passo 18
X-Cycle
valore: 184.9
categoria doc: X_Cycles
X-CYCLE on 1 (Discontinuous Alternating Nice Loop, length 6):
+1[H7]-1[J8]+1[F8]-1[F4]+1[H4]-1[H7]
- Contradiction: When H7 is set to 1 the chain implies it cannot be 1 - it can be removed
Passo 19
XY-Chain
valore: 198.5
categoria doc: XY_Chains
length=4, chain ends: B7 and J8
This proves 1 is the solution at one or possibly both ends of the chain
-1[B7]+9[B7]-9[A7]+7[A7]-7[A8]+6[A8]-6[J8]+1[J8]
- 1 can be removed from G7
Passo 20
Hidden Singles
valore: 3
categoria doc: Getting_Started
1 in B7 is last in column
Passo 21
Hidden Singles
valore: 2.9
categoria doc: Getting_Started
9 in A7 is last in column/box
9 in B5 is last in row
Passo 22
Hidden Singles
valore: 2.6
categoria doc: Getting_Started
3 in B6 is last in row/box
3 in E5 is last in column
7 in H7 is last in column
Passo 23
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 5 in E6 changed to solution
Passo 24
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 7 in E1 changed to solution
Passo 25
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 1 in E9 changed to solution
Last candidate 5 in F1 changed to solution
Passo 26
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 7 in F8 changed to solution
Passo 27
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 6 in A8 changed to solution
Passo 28
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 4 in B9 changed to solution
Last candidate 1 in J8 changed to solution
Passo 29
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 7 in A9 changed to solution
Last candidate 6 in B1 changed to solution
Last candidate 8 in J1 changed to solution
Passo 30
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 4 in A1 changed to solution
Last candidate 5 in J3 changed to solution
Passo 31
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 8 in A5 changed to solution
Last candidate 1 in C1 changed to solution
Last candidate 6 in J5 changed to solution
Passo 32
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 8 in C3 changed to solution
Last candidate 6 in C4 changed to solution
Last candidate 1 in F5 changed to solution
Passo 33
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 4 in C6 changed to solution
Last candidate 8 in F4 changed to solution
Passo 34
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 6 in F6 changed to solution
Last candidate 8 in G6 changed to solution
Last candidate 1 in H4 changed to solution
Passo 35
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 5 in G7 changed to solution
Last candidate 4 in H3 changed to solution
Passo 36
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 8 in D7 changed to solution
Last candidate 1 in G3 changed to solution
Last candidate 4 in G5 changed to solution
Last candidate 6 in G9 changed to solution
Last candidate 5 in H5 changed to solution
Last candidate 8 in H9 changed to solution
Passo 37
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 5 in D9 changed to solution