Passi risolutivi (30)
Passo 1
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 7 in F2 changed to solution
Passo 2
Naked Singles
valore: 1
categoria doc: Getting_Started
Last candidate 8 in F3 changed to solution
Passo 3
Naked Singles
valore: 2.6
categoria doc: Getting_Started
Last candidate 4 in E1 changed to solution
Last candidate 3 in F1 changed to solution
Passo 4
Naked Singles
valore: 2.6
categoria doc: Getting_Started
Last candidate 1 in E3 changed to solution
Passo 5
Naked Singles
valore: 2.5
categoria doc: Getting_Started
Last candidate 6 in D3 changed to solution
Passo 6
Hidden Singles
valore: 4.7
categoria doc: Getting_Started
2 in E9 is last in box
3 in D8 is last in row/column/box
6 in A5 is last in column/box
6 in G7 is last in column/box
Passo 7
Hidden Singles
valore: 4.3
categoria doc: Getting_Started
7 in G3 is last in row
9 in A9 is last in column
Passo 8
Naked Singles
valore: 1.9
categoria doc: Getting_Started
Last candidate 2 in B3 changed to solution
Passo 9
Hidden Singles
valore: 3.7
categoria doc: Getting_Started
2 in G2 is last in column/box
2 in H4 is last in row
Passo 10
Hidden Singles
valore: 3.5
categoria doc: Getting_Started
4 in G4 is last in row
Passo 11
Naked Pair
valore: 16.2
categoria doc: Naked_Candidates
Naked Pair 5/8 on cells {G5|G6} means
- 5/8 can be removed from J4
- 5/8 can be removed from J5
- 5/8 can be removed from J6
Last candidate 1 in J4 changed to solution
Passo 12
Hidden Singles
valore: 3
categoria doc: Getting_Started
1 in D5 is last in row/box
Passo 13
Naked Pair
valore: 14.4
categoria doc: Naked_Candidates
Naked Pair 3/9 on cells {J5|J6} means
- 9 can be removed from J1
- 9 can be removed from J3
Passo 14
Chute Remote Pair
valore: 71.5
categoria doc: Chute_Remote_Pairs
8 cannot be set in the yellow cells {A5,B5,C5} and with the Remote Pair in D4 and G6 it means:
- 5 can be removed from F6
Passo 15
Rectangle Elimination
valore: 70.8
categoria doc: Rectangle_Elimination
If +8[A7] then -8[A4] forcing +8[D4] which removes all 8s from Box 6, so A7 cannot be 8
Passo 16
Rectangle Elimination
valore: 70.2
categoria doc: Rectangle_Elimination
If +8[D9] then -8[D4] forcing +8[A4] which removes all 8s from Box 3, so D9 cannot be 8
Passo 17
Pointing Pairs
valore: 41.7
categoria doc: Intersection_Removal
Pair: between Box 6 and Col 7:
- 8 can be removed from H7
Passo 18
XY-Chain
valore: 206.3
categoria doc: XY_Chains
length=5, chain ends: A1 and G6
This proves 5 is the solution at one or possibly both ends of the chain
-5[A1]+7[A1]-7[B1]+6[B1]-6[B2]+1[B2]-1[B6]+8[B6]-8[G6]+5[G6]
- 5 can be removed from A6
Passo 19
3D Medusa
valore: 217.9
categoria doc: 3D_Medusa
(RULE 4): Uncoloured candidate 5 in C5 can see two different coloured candidates of 5 elsewhere.
Passo 20
Aligned Pair Exclusion
valore: 377.4
categoria doc: Aligned_Pair_Exclusion
Some solution combinations in the two gray cells would empty at least one of the coloured cells. Removing those combinations create eliminations in the gray cells.
Pair A4 / A6 reduced from 5/7/8->5/7/8 and 1/2/8->2/8
- Pair 1/8 found in ALS {B6}
- Combinations of 1/4/5/7 found in ALS {A1,A2,A7}
Passo 21
XY-Chain
valore: 196
categoria doc: XY_Chains
length=5. This XY-Chain is continuous and one value in each cell must be the solution, so all off-chain candidates can be removed
-2[A6]+8[A6]-8[G6]+5[G6]-5[G5]+8[G5]-8[E5]+9[E5]-9[F6]+2[F6]
- 8 can be removed from B6
- 9 can be removed from F5
- 2 can be removed from C6
Last candidate 1 in B6 changed to solution
Passo 22
Naked Singles
valore: 1.2
categoria doc: Getting_Started
Last candidate 6 in B2 changed to solution
Passo 23
Naked Singles
valore: 1.1
categoria doc: Getting_Started
Last candidate 7 in B1 changed to solution
Last candidate 4 in J2 changed to solution
Passo 24
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 5 in A1 changed to solution
Last candidate 1 in A2 changed to solution
Last candidate 8 in B9 changed to solution
Last candidate 5 in J3 changed to solution
Passo 25
Naked Singles
valore: 0.8
categoria doc: Getting_Started
Last candidate 9 in C1 changed to solution
Last candidate 9 in H3 changed to solution
Last candidate 7 in J9 changed to solution
Passo 26
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 4 in C3 changed to solution
Last candidate 5 in D9 changed to solution
Last candidate 8 in H1 changed to solution
Last candidate 8 in J8 changed to solution
Passo 27
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 8 in D4 changed to solution
Last candidate 9 in F7 changed to solution
Last candidate 4 in H8 changed to solution
Last candidate 1 in H9 changed to solution
Last candidate 6 in J1 changed to solution
Passo 28
Naked Singles
valore: 0.3
categoria doc: Getting_Started
Last candidate 7 in A4 changed to solution
Last candidate 7 in D7 changed to solution
Last candidate 9 in E5 changed to solution
Last candidate 8 in E7 changed to solution
Last candidate 2 in F6 changed to solution
Last candidate 5 in H7 changed to solution
Passo 29
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 8 in A6 changed to solution
Last candidate 4 in A7 changed to solution
Last candidate 2 in A8 changed to solution
Last candidate 5 in C4 changed to solution
Last candidate 1 in C7 changed to solution
Last candidate 5 in F5 changed to solution
Last candidate 3 in J5 changed to solution
Passo 30
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 2 in C5 changed to solution
Last candidate 3 in C6 changed to solution
Last candidate 7 in C8 changed to solution
Last candidate 8 in G5 changed to solution
Last candidate 5 in G6 changed to solution
Last candidate 9 in J6 changed to solution