Passi risolutivi (36)
Passo 1
Hidden Singles
valore: 5.9
categoria doc: Getting_Started
2 in C9 is last in column/box
4 in B2 is last in row/box
7 in A4 is last in column/box
7 in F2 is last in box
Passo 2
Hidden Singles
valore: 5.3
categoria doc: Getting_Started
7 in C3 is last in column/box
8 in C5 is last in box
8 in F4 is last in column
Passo 3
Naked Singles
valore: 2.3
categoria doc: Getting_Started
Last candidate 6 in C2 changed to solution
Last candidate 2 in F5 changed to solution
Passo 4
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 1 in C1 changed to solution
Passo 5
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 2 in A3 changed to solution
Passo 6
Naked Singles
valore: 2.1
categoria doc: Getting_Started
Last candidate 8 in A1 changed to solution
Passo 7
Naked Singles
valore: 2.1
categoria doc: Getting_Started
Last candidate 6 in A7 changed to solution
Passo 8
Hidden Singles
valore: 3.9
categoria doc: Getting_Started
1 in E4 is last in column
1 in G3 is last in row/column/box
2 in H6 is last in column/box
Passo 9
Hidden Singles
valore: 3.6
categoria doc: Getting_Started
1 in F9 is last in row/box
Passo 10
Naked Pair
valore: 17.2
categoria doc: Naked_Candidates
Naked Pair 3/5 on cells {C7|E7} means
- 5 can be removed from B7
- 3/5 can be removed from G7
- 3/5 can be removed from J7
Passo 11
Pointing Pairs
valore: 50.8
categoria doc: Intersection_Removal
Pair: between Box 2 and Col 6:
- 5 can be removed from D6
- 5 can be removed from J6
Passo 12
Pointing Pairs
valore: 49.9
categoria doc: Intersection_Removal
Pair: between Box 2 and Col 6:
- 9 can be removed from D6
- 9 can be removed from J6
Passo 13
Pointing Pairs
valore: 49.1
categoria doc: Intersection_Removal
Pair: between Box 3 and Col 8:
- 9 can be removed from G8
- 9 can be removed from H8
Passo 14
Pointing Pairs
valore: 48.7
categoria doc: Intersection_Removal
Pair: between Box 4 and Row E:
- 9 can be removed from E5
Passo 15
Line/Unit Reduction
valore: 63.8
categoria doc: Intersection_Removal
Line/Box Reduction: 4s in box 7 remove the following in the same box:
- 4 can be removed from G1
- 4 can be removed from J3
Passo 16
Rectangle Elimination
valore: 79.1
categoria doc: Rectangle_Elimination
If +6[J6] then -6[F6] forcing +6[F1] which removes all 6s from Box 7, so J6 cannot be 6
Passo 17
Pointing Pairs
valore: 47
categoria doc: Intersection_Removal
Pair: between Box 8 and Col 4:
- 6 can be removed from D4
Passo 18
Unique Rectangle 2+
valore: 155.4
categoria doc: Unique_Rectangles
Uniqueness Type 2b (Row) at DF16
The 4 in the roof cells (orange) stops a Deadly Pattern forming, so it must be placed in either D1 or D6. So..
- 4 can be removed from D5
Passo 19
Hidden Unique Rectangle
valore: 308.1
categoria doc: Hidden_Unique_Rectangles
Type 2b: removing 5 at E8 because of CE78 and one strong link on 3 between C7 and C8
Passo 20
3D Medusa
valore: 244.3
categoria doc: 3D_Medusa
(RULE 5): Uncoloured candidate 5 in B8 can see coloured 5 elsewhere and an oppositely coloured 8 in its own cell. It can be removed.
Passo 21
Hidden Unique Rectangle
valore: 302.6
categoria doc: Hidden_Unique_Rectangles
Type 2b: removing 3 at D1 because of DF16 and one strong link on 6 between F6 and D6
Passo 22
Forcing Nets
valore: 209.9
categoria doc: Forcing_Nets
If D5 is not 9 then both candidates in H2 are ON so D5 must be 9
Depth: 7 len: 16
-9[D5]+9[G5]-4[G5]+4[G7]-4[J7]+8[J7]-8[J2]+8[H2]
-9[D5]+9[G5]-4[G5]+4[E5]-4[E3]+4[H3]-9[H3]+9[H2]
Last candidate 9 in D5 changed to solution
Passo 23
X-Cycle
valore: 216.6
categoria doc: X_Cycles
X-CYCLE Rule 3 (Discontinuous Alternating Nice Loop, length 8):
+5[B9]-5[C7]+5[E7]-5[E5]+5[D4]-5[J4]+5[J9]-5[B9]
- Contradiction: When B9 is set to 5 the chain implies it cannot be 5 - it can be removed
Last candidate 7 in B9 changed to solution
Passo 24
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 8 in B7 changed to solution
Passo 25
Naked Singles
valore: 1.3
categoria doc: Getting_Started
Last candidate 1 in B8 changed to solution
Last candidate 4 in J7 changed to solution
Passo 26
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 9 in A8 changed to solution
Last candidate 5 in B6 changed to solution
Last candidate 7 in G7 changed to solution
Last candidate 3 in J6 changed to solution
Passo 27
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 1 in A6 changed to solution
Last candidate 9 in C6 changed to solution
Last candidate 6 in F6 changed to solution
Passo 28
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 4 in D6 changed to solution
Last candidate 3 in F1 changed to solution
Passo 29
Naked Singles
valore: 0.7
categoria doc: Getting_Started
Last candidate 6 in D1 changed to solution
Last candidate 5 in E5 changed to solution
Passo 30
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 3 in D4 changed to solution
Last candidate 3 in E7 changed to solution
Last candidate 4 in G5 changed to solution
Passo 31
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 5 in C7 changed to solution
Last candidate 5 in D9 changed to solution
Last candidate 6 in E8 changed to solution
Passo 32
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 3 in C8 changed to solution
Last candidate 7 in D8 changed to solution
Last candidate 9 in J9 changed to solution
Passo 33
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 5 in G8 changed to solution
Last candidate 3 in G9 changed to solution
Last candidate 8 in J2 changed to solution
Last candidate 6 in J3 changed to solution
Passo 34
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 2 in G1 changed to solution
Last candidate 8 in H8 changed to solution
Last candidate 5 in J4 changed to solution
Passo 35
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 4 in E1 changed to solution
Last candidate 9 in G2 changed to solution
Last candidate 9 in H4 changed to solution
Passo 36
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 2 in E2 changed to solution
Last candidate 9 in E3 changed to solution
Last candidate 6 in G4 changed to solution
Last candidate 5 in H1 changed to solution
Last candidate 3 in H2 changed to solution
Last candidate 4 in H3 changed to solution