Passi risolutivi (21)
Passo 1
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 7 in J1 changed to solution
Passo 2
Hidden Singles
valore: 5.8
categoria doc: Getting_Started
6 in A5 is last in row/box
9 in G7 is last in row/box
Passo 3
Pointing Pairs
valore: 82.9
categoria doc: Intersection_Removal
Pair: between Box 9 and Row H:
- 2 can be removed from H2
- 2 can be removed from H3
Passo 4
Pointing Pairs
valore: 81.7
categoria doc: Intersection_Removal
Pair: between Box 1 and Col 3:
- 5 can be removed from D3
- 5 can be removed from E3
- 5 can be removed from F3
Passo 5
Pointing Pairs
valore: 80.9
categoria doc: Intersection_Removal
Pair: between Box 2 and Row C:
- 8 can be removed from C2
- 8 can be removed from C3
Passo 6
Naked Pair
valore: 25.9
categoria doc: Naked_Candidates
Naked Pair 2/7 on cells {B2|C2} means
- 7 can be removed from A3
- 2/7 can be removed from B3
- 2/7 can be removed from C3
- 7 can be removed from D2
- 2/7 can be removed from F2
Passo 7
Sword-Fish
valore: 244.8
categoria doc: Sword_Fish_Strategy
(Col->Row) 4 taken off D3, SF=AEJ379
(Col->Row) 4 taken off F3, SF=AEJ379
(Col->Row) 4 taken off G3, SF=AEJ379
(Col->Row) 4 taken off H3, SF=AEJ379
(Col->Row) 4 taken off D7, SF=AEJ379
(Col->Row) 4 taken off F7, SF=AEJ379
(Col->Row) 4 taken off H7, SF=AEJ379
(Col->Row) 4 taken off D9, SF=AEJ379
(Col->Row) 4 taken off F9, SF=AEJ379
(Col->Row) 4 taken off H9, SF=AEJ379
Passo 8
X-Cycle
valore: 292.2
categoria doc: X_Cycles
X-CYCLE Rule 3 (Discontinuous Alternating Nice Loop, length 6):
+7[E7]-7[E5]+7[C5]-7[A6]+7[A7]-7[E7]
- Contradiction: When E7 is set to 7 the chain implies it cannot be 7 - it can be removed
Passo 9
XY-Chain
valore: 312.9
categoria doc: XY_Chains
length=4, chain ends: D1 and E5
This proves 5 is the solution at one or possibly both ends of the chain
-5[D1]+8[D1]-8[F2]+4[F2]-4[F4]+7[F4]-7[E5]+5[E5]
- 5 can be removed from D6
- 5 can be removed from E1
Last candidate 2 in E1 changed to solution
Passo 10
Hidden Singles
valore: 4.5
categoria doc: Getting_Started
2 in G3 is last in row/column/box
5 in E5 is last in box
5 in H6 is last in column
Passo 11
Naked Singles
valore: 2
categoria doc: Getting_Started
Last candidate 1 in J5 changed to solution
Passo 12
Naked Singles
valore: 1.9
categoria doc: Getting_Started
Last candidate 8 in G5 changed to solution
Last candidate 4 in G6 changed to solution
Passo 13
Naked Singles
valore: 1.6
categoria doc: Getting_Started
Last candidate 7 in C5 changed to solution
Last candidate 7 in D6 changed to solution
Last candidate 3 in G1 changed to solution
Last candidate 6 in G4 changed to solution
Passo 14
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 9 in A6 changed to solution
Last candidate 3 in B4 changed to solution
Last candidate 2 in C2 changed to solution
Last candidate 4 in F4 changed to solution
Last candidate 1 in G8 changed to solution
Last candidate 7 in H4 changed to solution
Passo 15
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 8 in A1 changed to solution
Last candidate 7 in B2 changed to solution
Last candidate 8 in C4 changed to solution
Last candidate 1 in C6 changed to solution
Last candidate 8 in F2 changed to solution
Passo 16
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 3 in A3 changed to solution
Last candidate 2 in B6 changed to solution
Last candidate 5 in B8 changed to solution
Last candidate 5 in D1 changed to solution
Passo 17
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 4 in A9 changed to solution
Last candidate 9 in B3 changed to solution
Last candidate 1 in B7 changed to solution
Last candidate 3 in C7 changed to solution
Last candidate 9 in F1 changed to solution
Last candidate 7 in F8 changed to solution
Passo 18
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 7 in A7 changed to solution
Last candidate 5 in C3 changed to solution
Last candidate 9 in C9 changed to solution
Last candidate 6 in E9 changed to solution
Last candidate 1 in F3 changed to solution
Passo 19
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 6 in D3 changed to solution
Last candidate 8 in D7 changed to solution
Last candidate 4 in E7 changed to solution
Last candidate 5 in J9 changed to solution
Passo 20
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 4 in D2 changed to solution
Last candidate 3 in D8 changed to solution
Last candidate 7 in E3 changed to solution
Last candidate 2 in F9 changed to solution
Last candidate 8 in H3 changed to solution
Last candidate 4 in J3 changed to solution
Last candidate 6 in J7 changed to solution
Passo 21
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 1 in D9 changed to solution
Last candidate 5 in F7 changed to solution
Last candidate 6 in H2 changed to solution
Last candidate 2 in H7 changed to solution
Last candidate 4 in H8 changed to solution
Last candidate 3 in H9 changed to solution