Passi risolutivi (20)
Passo 1
Hidden Singles
valore: 5.4
categoria doc: Getting_Started
1 in B1 is last in column/box
1 in C7 is last in row
1 in G5 is last in column
2 in C8 is last in column/box
2 in H3 is last in column
3 in H8 is last in column/box
3 in J5 is last in row
7 in C2 is last in row/box
8 in B6 is last in column/box
Passo 2
Hidden Singles
valore: 4.3
categoria doc: Getting_Started
3 in A3 is last in row
3 in B4 is last in box
6 in C6 is last in column/box
6 in D8 is last in column
7 in G7 is last in row
8 in G3 is last in column/box
Passo 3
Naked Singles
valore: 1.5
categoria doc: Getting_Started
Last candidate 9 in D7 changed to solution
Last candidate 9 in G8 changed to solution
Last candidate 8 in H7 changed to solution
Passo 4
Hidden Singles
valore: 2.9
categoria doc: Getting_Started
2 in B5 is last in row/box
6 in B3 is last in column
6 in E1 is last in row/box
7 in J1 is last in row
Passo 5
Hidden Singles
valore: 2.4
categoria doc: Getting_Started
2 in D1 is last in column/box
2 in E4 is last in row
6 in H9 is last in row
6 in J2 is last in column/box
Passo 6
Hidden Pair
valore: 21.2
categoria doc: Hidden_Candidates
Hidden Pair 1/3 in Box 5, on cells {D6|F6}
- removes 4/5 from D6
- removes 4/5/9 from F6
Passo 7
Pointing Pairs
valore: 30.9
categoria doc: Intersection_Removal
Pair: between Box 5 and Col 4:
- 5 can be removed from C4
- 5 can be removed from H4
Passo 8
Pointing Pairs
valore: 30.5
categoria doc: Intersection_Removal
Pair: between Box 2 and Col 5:
- 5 can be removed from H5
Passo 9
Pointing Pairs
valore: 30.1
categoria doc: Intersection_Removal
Pair: between Box 4 and Row F:
- 9 can be removed from F4
Passo 10
Line/Unit Reduction
valore: 39.6
categoria doc: Intersection_Removal
Line/Box Reduction: 9s in box 2 remove the following in the same box:
- 9 can be removed from A5
Passo 11
Chute Remote Pair
valore: 48.8
categoria doc: Chute_Remote_Pairs
5 cannot be set in the yellow cells {A2,B2,C2} and with the Remote Pair in F3 and H1 it means:
- 4 can be removed from F1
Passo 12
Rectangle Elimination
valore: 48.1
categoria doc: Rectangle_Elimination
If +4[F2] then -4[B2] forcing +4[B9] which removes all 4s from box 6, so F2 cannot be 4
Passo 13
Rectangle Elimination
valore: 47.5
categoria doc: Rectangle_Elimination
If +4[F9] then -4[B9] forcing +4[B2] which removes all 4s from box 4, so F9 cannot be 4
Passo 14
X-Cycle
valore: 112.2
categoria doc: X_Cycles
X-CYCLE on 4 (Discontinuous Alternating Nice Loop, length 6):
+4[A1]-4[C3]+4[F3]-4[F8]+4[A8]-4[A1]
- Contradiction: When A1 is set to 4 the chain implies it cannot be 4 - it can be removed
Passo 15
Hidden Singles
valore: 1.8
categoria doc: Getting_Started
4 in H1 is last in column
Passo 16
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 5 in G2 changed to solution
Last candidate 4 in G6 changed to solution
Last candidate 9 in E6 changed to solution
Last candidate 5 in H6 changed to solution
Passo 17
Hidden Singles
valore: 1.4
categoria doc: Getting_Started
5 in D4 is last in row
Passo 18
X-Wing
valore: 38.8
categoria doc: X_Wing_Strategy
(Col->Row) 4 taken off A9, based on BD29
(Col->Row) 4 taken off E9, based on BD29
Last candidate 7 in E9 changed to solution
Passo 19
Naked Singles
valore: 0.5
categoria doc: Getting_Started
Last candidate 4 in E5 changed to solution
Last candidate 7 in F4 changed to solution
Last candidate 9 in H4 changed to solution
Last candidate 7 in H5 changed to solution
Last candidate 5 in A5 changed to solution
Last candidate 4 in C4 changed to solution
Last candidate 9 in C5 changed to solution
Passo 20
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 9 in A1 changed to solution
Last candidate 8 in A9 changed to solution
Last candidate 4 in B2 changed to solution
Last candidate 9 in B9 changed to solution
Last candidate 5 in C3 changed to solution
Last candidate 3 in D2 changed to solution
Last candidate 1 in D6 changed to solution
Last candidate 4 in D9 changed to solution
Last candidate 5 in F1 changed to solution
Last candidate 9 in F2 changed to solution
Last candidate 4 in F3 changed to solution
Last candidate 3 in F6 changed to solution
Last candidate 8 in F8 changed to solution
Last candidate 1 in F9 changed to solution
Last candidate 4 in A8 changed to solution