Passi risolutivi (31)
Passo 1
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 4 in H3 changed to solution
Passo 2
Naked Singles
valore: 2.7
categoria doc: Getting_Started
Last candidate 8 in G3 changed to solution
Passo 3
Naked Singles
valore: 2.6
categoria doc: Getting_Started
Last candidate 3 in G1 changed to solution
Last candidate 9 in J3 changed to solution
Passo 4
Hidden Singles
valore: 4.5
categoria doc: Getting_Started
1 in F2 is last in row/box
1 in G6 is last in column
4 in C9 is last in box
5 in C4 is last in column
5 in D9 is last in row/column/box
Passo 5
Hidden Pair
valore: 41.8
categoria doc: Hidden_Candidates
Hidden Pair 8/9 in Row B, on cells {B2|B7}
- removes 3 from B2
Passo 6
Hidden Singles
valore: 4.1
categoria doc: Getting_Started
3 in C2 is last in column/box
Passo 7
Pointing Pairs
valore: 60.2
categoria doc: Intersection_Removal
Pair: between Box 3 and Col 7:
- 7 can be removed from E7
- 7 can be removed from G7
Passo 8
Pointing Pairs
valore: 59.4
categoria doc: Intersection_Removal
Pair: between Box 1 and Col 2:
- 8 can be removed from D2
- 8 can be removed from E2
Passo 9
Pointing Pairs
valore: 58.6
categoria doc: Intersection_Removal
Pair: between Box 3 and Col 7:
- 8 can be removed from E7
- 8 can be removed from J7
Passo 10
Hidden Singles
valore: 3.9
categoria doc: Getting_Started
8 in J8 is last in row/box
Passo 11
Hidden Singles
valore: 3.7
categoria doc: Getting_Started
4 in G8 is last in column/box
Passo 12
Hidden Singles
valore: 3.6
categoria doc: Getting_Started
7 in G9 is last in row/box
Passo 13
Naked Pair
valore: 16.2
categoria doc: Naked_Candidates
Naked Pair 2/6 on cells {C5|G5} means
- 2 can be removed from A5
- 6 can be removed from B5
- 2/6 can be removed from D5
- 2/6 can be removed from E5
- 2/6 can be removed from F5
- 2/6 can be removed from H5
Passo 14
Naked Pair
valore: 16.1
categoria doc: Naked_Candidates
Naked Pair 6/8 on cells {E9|F9} means
- 6 can be removed from E7
Passo 15
Hidden Pair
valore: 31.9
categoria doc: Hidden_Candidates
Hidden Pair 2/6 in Box 8, on cells {G5|H6}
- removes 3 from H6
Passo 16
Pointing Pairs
valore: 47.5
categoria doc: Intersection_Removal
Pair: between Box 3 and Col 7:
- 9 can be removed from E7
Passo 17
Hidden Triple
valore: 76.3
categoria doc: Hidden_Candidates
Hidden Triple 7/8/9 in Box 5, on cells {D5|E5|F5}
- removes 4 from D5
- removes 3/4 from E5
- removes 3 from F5
Passo 18
Hidden Singles
valore: 3
categoria doc: Getting_Started
4 in E2 is last in row
Passo 19
Pointing Pairs
valore: 43.7
categoria doc: Intersection_Removal
Pair: between Box 5 and Row F:
- 3 can be removed from F8
Passo 20
X-Cycle
valore: 216.6
categoria doc: X_Cycles
X-CYCLE on 2 (Discontinuous Alternating Nice Loop, length 8):
+2[D6]-2[D2]+2[E3]-2[C3]+2[C5]-2[G5]+2[H6]-2[D6]
- Contradiction: When D6 is set to 2 the chain implies it cannot be 2 - it can be removed
Passo 21
XY-Chain
valore: 214.6
categoria doc: XY_Chains
length=5, chain ends: A4 and D6
This proves 4 is the solution at one or possibly both ends of the chain
-4[A4]+2[A4]-2[C5]+6[C5]-6[G5]+2[G5]-2[H6]+6[H6]-6[D6]+4[D6]
- 4 can be removed from D4
Passo 22
Hidden Singles
valore: 2.8
categoria doc: Getting_Started
4 in A4 is last in column
4 in D6 is last in row/box
Passo 23
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 1 in A5 changed to solution
Last candidate 3 in J6 changed to solution
Passo 24
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 3 in B5 changed to solution
Last candidate 5 in H5 changed to solution
Last candidate 5 in J7 changed to solution
Passo 25
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 6 in B4 changed to solution
Last candidate 4 in J5 changed to solution
Passo 26
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 1 in B3 changed to solution
Last candidate 2 in C5 changed to solution
Last candidate 2 in D4 changed to solution
Passo 27
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 9 in D2 changed to solution
Last candidate 3 in F4 changed to solution
Last candidate 6 in F6 changed to solution
Last candidate 6 in G5 changed to solution
Passo 28
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 8 in B2 changed to solution
Last candidate 7 in D8 changed to solution
Last candidate 8 in F9 changed to solution
Last candidate 2 in G7 changed to solution
Last candidate 2 in H6 changed to solution
Passo 29
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 2 in A2 changed to solution
Last candidate 9 in B7 changed to solution
Last candidate 8 in D5 changed to solution
Last candidate 3 in E7 changed to solution
Last candidate 6 in E9 changed to solution
Last candidate 7 in F1 changed to solution
Last candidate 3 in H8 changed to solution
Passo 30
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 7 in A3 changed to solution
Last candidate 7 in C7 changed to solution
Last candidate 6 in D1 changed to solution
Last candidate 8 in E1 changed to solution
Last candidate 2 in E3 changed to solution
Last candidate 9 in F5 changed to solution
Last candidate 6 in H7 changed to solution
Passo 31
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 8 in A7 changed to solution
Last candidate 9 in C1 changed to solution
Last candidate 6 in C3 changed to solution
Last candidate 7 in E5 changed to solution
Last candidate 9 in E8 changed to solution
Last candidate 2 in F8 changed to solution