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Sudoku Solve Path

GradoTough Livello4 (precedente: 4)
Punteggio finale7.1 Punteggio precedente236
Indizi23 # Passi31
Versione generatoreversion 4.21, 22-Jul-2026
Soluzione192347865736895241485162397327651984918473526654928173879514632543286719261739458
FileD:\inetpub\webs\ruggeriinfo\public\sudoku\json\L3_30_06_2026_2026_07_24_13_34_27172116.json

Passi risolutivi (31)

Passo 1 Hidden Singles valore: 6.2 categoria doc: Getting_Started
5 in C3 is last in row/box
5 in F2 is last in column
6 in E9 is last in row/box
8 in G1 is last in column/box
8 in H5 is last in row
Passo 2 Hidden Singles valore: 5.6 categoria doc: Getting_Started
5 in D5 is last in row/box
6 in B3 is last in column/box
Passo 3 Hidden Singles valore: 5.4 categoria doc: Getting_Started
2 in A3 is last in column/box
Passo 4 Hidden Singles valore: 5 categoria doc: Getting_Started
2 in C6 is last in column
7 in D3 is last in column
Passo 5 Naked Singles valore: 2.3 categoria doc: Getting_Started
Last candidate 9 in E1 changed to solution
Passo 6 Naked Singles valore: 2.2 categoria doc: Getting_Started
Last candidate 1 in E2 changed to solution
Passo 7 Naked Singles valore: 2.2 categoria doc: Getting_Started
Last candidate 2 in E8 changed to solution
Passo 8 Naked Singles valore: 2.1 categoria doc: Getting_Started
Last candidate 7 in E5 changed to solution
Passo 9 Hidden Singles valore: 3.9 categoria doc: Getting_Started
2 in B7 is last in row/box
2 in F5 is last in row/column/box
2 in G9 is last in column
6 in C5 is last in row/box
Passo 10 Hidden Singles valore: 3.6 categoria doc: Getting_Started
1 in C4 is last in row/box
1 in G5 is last in column
Passo 11 Naked Singles valore: 1.6 categoria doc: Getting_Started
Last candidate 9 in F4 changed to solution
Passo 12 Naked Singles valore: 1.5 categoria doc: Getting_Started
Last candidate 1 in D6 changed to solution
Last candidate 5 in G4 changed to solution
Passo 13 Naked Singles valore: 1.4 categoria doc: Getting_Started
Last candidate 7 in J4 changed to solution
Passo 14 Hidden Singles valore: 2.6 categoria doc: Getting_Started
1 in F7 is last in row/box
5 in J8 is last in row/column/box
7 in A6 is last in column/box
7 in B1 is last in row
Passo 15 Hidden Singles valore: 2.2 categoria doc: Getting_Started
1 in H8 is last in column/box
1 in J3 is last in row
Passo 16 Pointing Pairs valore: 31.8 categoria doc: Intersection_Removal
Pair: between Box 1 and Col 2:
- 9 can be removed from H2
Passo 17 Rectangle Elimination valore: 52.3 categoria doc: Rectangle_Elimination
If +3[C9] then -3[C1] forcing +3[D1] which removes all 3s from Box 6, so C9 cannot be 3
Passo 18 Rectangle Elimination valore: 51.6 categoria doc: Rectangle_Elimination
If +3[H9] then -3[F9] forcing +3[F3] which removes all 3s from Box 7, so H9 cannot be 3
Passo 19 Line/Unit Reduction valore: 40.2 categoria doc: Intersection_Removal
Line/Box Reduction: 3s in box 6 remove the following in the same box:
- 3 can be removed from D7
- 3 can be removed from D8
Passo 20 Rectangle Elimination valore: 49.5 categoria doc: Rectangle_Elimination
If +4[C9] then -4[C1] forcing +4[D1] which removes all 4s from Box 6, so C9 cannot be 4
Last candidate 7 in C9 changed to solution
Passo 21 Hidden Singles valore: 1.8 categoria doc: Getting_Started
7 in H7 is last in row/column/box
Passo 22 Hidden Singles valore: 1.6 categoria doc: Getting_Started
6 in G7 is last in column/box
6 in H6 is last in row
Passo 23 Hidden Singles valore: 1.5 categoria doc: Getting_Started
3 in G8 is last in box
Passo 24 Rectangle Elimination valore: 35.1 categoria doc: Rectangle_Elimination
If +4[H9] then -4[F9] forcing +4[F3] which removes all 4s from Box 7, so H9 cannot be 4
Last candidate 9 in H9 changed to solution
Passo 25 Naked Singles valore: 0.6 categoria doc: Getting_Started
Last candidate 4 in J7 changed to solution
Passo 26 Naked Singles valore: 0.5 categoria doc: Getting_Started
Last candidate 3 in C7 changed to solution
Last candidate 9 in J6 changed to solution
Passo 27 Naked Singles valore: 0.4 categoria doc: Getting_Started
Last candidate 8 in A7 changed to solution
Last candidate 4 in C1 changed to solution
Last candidate 4 in G6 changed to solution
Passo 28 Naked Singles valore: 0.2 categoria doc: Getting_Started
Last candidate 3 in A4 changed to solution
Last candidate 4 in B8 changed to solution
Last candidate 3 in D1 changed to solution
Last candidate 9 in D7 changed to solution
Last candidate 9 in G3 changed to solution
Passo 29 Naked Singles valore: 0.1 categoria doc: Getting_Started
Last candidate 9 in A2 changed to solution
Last candidate 8 in B4 changed to solution
Last candidate 9 in B5 changed to solution
Last candidate 8 in D8 changed to solution
Last candidate 4 in D9 changed to solution
Last candidate 4 in F3 changed to solution
Passo 30 Naked Singles valore: 0 categoria doc: Getting_Started
Last candidate 4 in A5 changed to solution
Last candidate 3 in B2 changed to solution
Last candidate 3 in F9 changed to solution
Last candidate 3 in H3 changed to solution
Passo 31 Naked Singles valore: 0 categoria doc: Getting_Started
Last candidate 4 in H2 changed to solution