Passi risolutivi (31)
Passo 1
Hidden Singles
valore: 5.6
categoria doc: Getting_Started
2 in A6 is last in column/box
2 in J3 is last in row
3 in G7 is last in column/box
4 in G4 is last in column/box
4 in H3 is last in row
8 in A3 is last in row/box
Passo 2
Hidden Singles
valore: 4.9
categoria doc: Getting_Started
2 in F2 is last in column/box
Passo 3
Pointing Pairs
valore: 71.4
categoria doc: Intersection_Removal
Pair: between Box 8 and Col 5:
- 1 can be removed from B5
- 1 can be removed from C5
Passo 4
Pointing Pairs
valore: 70.6
categoria doc: Intersection_Removal
Pair: between Box 1 and Row C:
- 3 can be removed from C4
- 3 can be removed from C5
Passo 5
Pointing Pairs
valore: 69.3
categoria doc: Intersection_Removal
Triple: between Box 2 and Col 5:
- 5 can be removed from G5
- 5 can be removed from H5
- 5 can be removed from J5
Passo 6
Hidden Singles
valore: 4.6
categoria doc: Getting_Started
5 in J6 is last in row
Passo 7
Naked Singles
valore: 2.2
categoria doc: Getting_Started
Last candidate 9 in H6 changed to solution
Passo 8
Pointing Pairs
valore: 64
categoria doc: Intersection_Removal
Pair: between Box 7 and Row G:
- 5 can be removed from G8
- 5 can be removed from G9
Passo 9
Pointing Pairs
valore: 62.7
categoria doc: Intersection_Removal
Pair: between Box 5 and Col 4:
- 9 can be removed from A4
- 9 can be removed from B4
- 9 can be removed from C4
Passo 10
Line/Unit Reduction
valore: 82.5
categoria doc: Intersection_Removal
Line/Box Reduction: 3s in box 5 remove the following in the same box:
- 3 can be removed from D4
- 3 can be removed from F4
Passo 11
Line/Unit Reduction
valore: 80.3
categoria doc: Intersection_Removal
Line/Box Reduction: 5s in box 3 remove the following in the same box:
- 5 can be removed from A7
- 5 can be removed from B7
- 5 can be removed from C7
- 5 can be removed from C8
Last candidate 6 in A7 changed to solution
Passo 12
Naked Singles
valore: 1.8
categoria doc: Getting_Started
Last candidate 3 in A4 changed to solution
Last candidate 1 in B7 changed to solution
Passo 13
Hidden Singles
valore: 3.5
categoria doc: Getting_Started
1 in C4 is last in row/column/box
3 in J5 is last in row/column/box
Passo 14
W-Wing
valore: 84.6
categoria doc: W_Wings
W-Wing (single). Either there is a 7 in F7 or in J4. They are connected through 8 in H7/H5, therefore
- 7 can be removed from F4
Passo 15
Rectangle Elimination
valore: 83.9
categoria doc: Rectangle_Elimination
If +8[D7] then -8[D2] forcing +8[G2] which removes all 8s from Box 9, so D7 cannot be 8
Passo 16
Rectangle Elimination
valore: 83.2
categoria doc: Rectangle_Elimination
If +8[E1] then -8[J1] forcing +8[J4] which removes all 8s from Box 5, so E1 cannot be 8
Passo 17
Pointing Pairs
valore: 49.5
categoria doc: Intersection_Removal
Pair: between Box 4 and Row D:
- 8 can be removed from D4
Passo 18
Rectangle Elimination
valore: 81.8
categoria doc: Rectangle_Elimination
If +8[F7] then -8[H7] forcing +8[H5] which removes all 8s from Box 5, so F7 cannot be 8
Last candidate 7 in F7 changed to solution
Passo 19
Rectangle Elimination
valore: 77.7
categoria doc: Rectangle_Elimination
If +7[D1] then -7[D6] forcing +7[G6] which removes all 7s from Box 7, so D1 cannot be 7
Passo 20
XY-Chain
valore: 231.1
categoria doc: XY_Chains
length=5, chain ends: H7 and J4
This proves 8 is the solution at one or possibly both ends of the chain
-8[H7]+5[H7]-5[D7]+4[D7]-4[D1]+8[D1]-8[J1]+7[J1]-7[J4]+8[J4]
- 8 can be removed from H5
Last candidate 1 in H5 changed to solution
Passo 21
Naked Singles
valore: 1.5
categoria doc: Getting_Started
Last candidate 5 in H8 changed to solution
Passo 22
Naked Singles
valore: 1.4
categoria doc: Getting_Started
Last candidate 8 in H7 changed to solution
Passo 23
Hidden Singles
valore: 2.8
categoria doc: Getting_Started
5 in D7 is last in row/column/box
Passo 24
3D Medusa
valore: 198.1
categoria doc: 3D_Medusa
(RULE 2): Two 8s in a single unit (in Col 1) have the same color in cells D1 J1 - all yellow coloured candidates can be removed
Last candidate 2 in C7 changed to solution
Last candidate 4 in D1 changed to solution
Last candidate 4 in E7 changed to solution
Last candidate 2 in E9 changed to solution
Last candidate 7 in J1 changed to solution
Last candidate 8 in J4 changed to solution
Passo 25
Naked Singles
valore: 0.9
categoria doc: Getting_Started
Last candidate 6 in E1 changed to solution
Last candidate 5 in G2 changed to solution
Last candidate 1 in G9 changed to solution
Passo 26
Naked Singles
valore: 0.6
categoria doc: Getting_Started
Last candidate 7 in B2 changed to solution
Last candidate 9 in C1 changed to solution
Last candidate 7 in E3 changed to solution
Last candidate 9 in G3 changed to solution
Last candidate 2 in G8 changed to solution
Passo 27
Naked Singles
valore: 0.4
categoria doc: Getting_Started
Last candidate 6 in B4 changed to solution
Last candidate 3 in C2 changed to solution
Last candidate 4 in C8 changed to solution
Last candidate 5 in C9 changed to solution
Last candidate 8 in E5 changed to solution
Last candidate 8 in G1 changed to solution
Passo 28
Naked Singles
valore: 0.2
categoria doc: Getting_Started
Last candidate 9 in A9 changed to solution
Last candidate 5 in B3 changed to solution
Last candidate 6 in C3 changed to solution
Last candidate 7 in C5 changed to solution
Last candidate 8 in D2 changed to solution
Last candidate 9 in F4 changed to solution
Passo 29
Naked Singles
valore: 0.1
categoria doc: Getting_Started
Last candidate 5 in A5 changed to solution
Last candidate 9 in B5 changed to solution
Last candidate 7 in D4 changed to solution
Last candidate 1 in F8 changed to solution
Last candidate 8 in F9 changed to solution
Last candidate 6 in G5 changed to solution
Passo 30
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 3 in D6 changed to solution
Last candidate 9 in D8 changed to solution
Last candidate 3 in F3 changed to solution
Last candidate 7 in G6 changed to solution
Passo 31
Naked Singles
valore: 0
categoria doc: Getting_Started
Last candidate 1 in D3 changed to solution
Last candidate 6 in F6 changed to solution