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How can I solve this sudoku?
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$begingroup$
I've almost finished this hard sudoku, but I cannot finish it without guessing or making multiple blind steps to see if I'm wrong or not. Even https://www.sudoku-solutions.com/ gives up and says "there is no hint available". I've tried to apply as many solving techniques as possible, but to no avail. Can anyone help?
sudoku
asked 9 hours ago
AndrejsAndrejs
1083 bronze badges
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Andrejs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
$begingroup$
I've almost finished this hard sudoku, but I cannot finish it without guessing or making multiple blind steps to see if I'm wrong or not. Even https://www.sudoku-solutions.com/ gives up and says "there is no hint available". I've tried to apply as many solving techniques as possible, but to no avail. Can anyone help?
sudoku
asked 9 hours ago
AndrejsAndrejs
1083 bronze badges
New contributor
Andrejs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
1
$begingroup$
It is often a mistake, but some sudoku puzzles have multiple solutions... I'll have a look though.
$endgroup$
– Joshua Bizley
9 hours ago
$begingroup$
Thank you, I've also just found this: puzzling.stackexchange.com/questions/252/…, from which I understood it's acceptable to make multiple assumptions on multiple cells (what I called "blind steps forward") and see if you come to a dead end or not...
$endgroup$
– Andrejs
9 hours ago
1
$begingroup$
It's not enough to see if you come to a dead end though; you'll need to see if the solution you found was unique; otherwise you'll end up claiming to have solved a sudoku that wasn't actually a sudoku.
$endgroup$
– Bass
9 hours ago
$begingroup$
Thank you, I guess I need to read up on solution uniqueness and what it means in the world of sudoku
$endgroup$
– Andrejs
9 hours ago
add a comment |
$begingroup$
I've almost finished this hard sudoku, but I cannot finish it without guessing or making multiple blind steps to see if I'm wrong or not. Even https://www.sudoku-solutions.com/ gives up and says "there is no hint available". I've tried to apply as many solving techniques as possible, but to no avail. Can anyone help?
sudoku
asked 9 hours ago
AndrejsAndrejs
1083 bronze badges
New contributor
Andrejs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I've almost finished this hard sudoku, but I cannot finish it without guessing or making multiple blind steps to see if I'm wrong or not. Even https://www.sudoku-solutions.com/ gives up and says "there is no hint available". I've tried to apply as many solving techniques as possible, but to no avail. Can anyone help?
sudoku
sudoku
asked 9 hours ago
AndrejsAndrejs
1083 bronze badges
New contributor
Andrejs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 9 hours ago
AndrejsAndrejs
1083 bronze badges
New contributor
Andrejs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 9 hours ago
AndrejsAndrejs
1083 bronze badges
New contributor
Andrejs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 9 hours ago
AndrejsAndrejs
1083 bronze badges
asked 9 hours ago
AndrejsAndrejs
1083 bronze badges
1083 bronze badges
New contributor
Andrejs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Andrejs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
$begingroup$
It is often a mistake, but some sudoku puzzles have multiple solutions... I'll have a look though.
$endgroup$
– Joshua Bizley
9 hours ago
$begingroup$
Thank you, I've also just found this: puzzling.stackexchange.com/questions/252/…, from which I understood it's acceptable to make multiple assumptions on multiple cells (what I called "blind steps forward") and see if you come to a dead end or not...
$endgroup$
– Andrejs
9 hours ago
1
$begingroup$
It's not enough to see if you come to a dead end though; you'll need to see if the solution you found was unique; otherwise you'll end up claiming to have solved a sudoku that wasn't actually a sudoku.
$endgroup$
– Bass
9 hours ago
$begingroup$
Thank you, I guess I need to read up on solution uniqueness and what it means in the world of sudoku
$endgroup$
– Andrejs
9 hours ago
add a comment |
1
$begingroup$
It is often a mistake, but some sudoku puzzles have multiple solutions... I'll have a look though.
$endgroup$
– Joshua Bizley
9 hours ago
$begingroup$
Thank you, I've also just found this: puzzling.stackexchange.com/questions/252/…, from which I understood it's acceptable to make multiple assumptions on multiple cells (what I called "blind steps forward") and see if you come to a dead end or not...
$endgroup$
– Andrejs
9 hours ago
1
$begingroup$
It's not enough to see if you come to a dead end though; you'll need to see if the solution you found was unique; otherwise you'll end up claiming to have solved a sudoku that wasn't actually a sudoku.
$endgroup$
– Bass
9 hours ago
$begingroup$
Thank you, I guess I need to read up on solution uniqueness and what it means in the world of sudoku
$endgroup$
– Andrejs
9 hours ago
1
1
$begingroup$
It is often a mistake, but some sudoku puzzles have multiple solutions... I'll have a look though.
$endgroup$
– Joshua Bizley
9 hours ago
$begingroup$
It is often a mistake, but some sudoku puzzles have multiple solutions... I'll have a look though.
$endgroup$
– Joshua Bizley
9 hours ago
$begingroup$
Thank you, I've also just found this: puzzling.stackexchange.com/questions/252/…, from which I understood it's acceptable to make multiple assumptions on multiple cells (what I called "blind steps forward") and see if you come to a dead end or not...
$endgroup$
– Andrejs
9 hours ago
$begingroup$
Thank you, I've also just found this: puzzling.stackexchange.com/questions/252/…, from which I understood it's acceptable to make multiple assumptions on multiple cells (what I called "blind steps forward") and see if you come to a dead end or not...
$endgroup$
– Andrejs
9 hours ago
1
1
$begingroup$
It's not enough to see if you come to a dead end though; you'll need to see if the solution you found was unique; otherwise you'll end up claiming to have solved a sudoku that wasn't actually a sudoku.
$endgroup$
– Bass
9 hours ago
$begingroup$
It's not enough to see if you come to a dead end though; you'll need to see if the solution you found was unique; otherwise you'll end up claiming to have solved a sudoku that wasn't actually a sudoku.
$endgroup$
– Bass
9 hours ago
$begingroup$
Thank you, I guess I need to read up on solution uniqueness and what it means in the world of sudoku
$endgroup$
– Andrejs
9 hours ago
$begingroup$
Thank you, I guess I need to read up on solution uniqueness and what it means in the world of sudoku
$endgroup$
– Andrejs
9 hours ago
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
If F1 is a 2, then
G1 is "not 2", G9 must be 2, and E9 cannot be a 2.
On the other hand, if F1 is not a 2, then
E2 must be a 2, so E9 cannot be 2.
Therefore,
E9 cannot be 2.
answered 9 hours ago
BassBass
35.4k4 gold badges86 silver badges205 bronze badges
$endgroup$
$begingroup$
Genius, thank you. Is there a name for this logic, such as swordfish? Or just logic? :)
$endgroup$
– Andrejs
8 hours ago
add a comment |
$begingroup$
The answer is
It is the only solution because it follows logically from placing an 8 on A7, and placing a 2 on A7 led to this contradiction for me (no 2 on row 8). Bass provides more intelligent reasoning for this step.
answered 9 hours ago
Joshua BizleyJoshua Bizley
38810 bronze badges
New contributor
Joshua Bizley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
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votes
$begingroup$
If F1 is a 2, then
G1 is "not 2", G9 must be 2, and E9 cannot be a 2.
On the other hand, if F1 is not a 2, then
E2 must be a 2, so E9 cannot be 2.
Therefore,
E9 cannot be 2.
answered 9 hours ago
BassBass
35.4k4 gold badges86 silver badges205 bronze badges
$endgroup$
$begingroup$
Genius, thank you. Is there a name for this logic, such as swordfish? Or just logic? :)
$endgroup$
– Andrejs
8 hours ago
add a comment |
$begingroup$
If F1 is a 2, then
G1 is "not 2", G9 must be 2, and E9 cannot be a 2.
On the other hand, if F1 is not a 2, then
E2 must be a 2, so E9 cannot be 2.
Therefore,
E9 cannot be 2.
answered 9 hours ago
BassBass
35.4k4 gold badges86 silver badges205 bronze badges
$endgroup$
$begingroup$
Genius, thank you. Is there a name for this logic, such as swordfish? Or just logic? :)
$endgroup$
– Andrejs
8 hours ago
add a comment |
$begingroup$
If F1 is a 2, then
G1 is "not 2", G9 must be 2, and E9 cannot be a 2.
On the other hand, if F1 is not a 2, then
E2 must be a 2, so E9 cannot be 2.
Therefore,
E9 cannot be 2.
answered 9 hours ago
BassBass
35.4k4 gold badges86 silver badges205 bronze badges
$endgroup$
If F1 is a 2, then
G1 is "not 2", G9 must be 2, and E9 cannot be a 2.
On the other hand, if F1 is not a 2, then
E2 must be a 2, so E9 cannot be 2.
Therefore,
E9 cannot be 2.
answered 9 hours ago
BassBass
35.4k4 gold badges86 silver badges205 bronze badges
answered 9 hours ago
BassBass
35.4k4 gold badges86 silver badges205 bronze badges
answered 9 hours ago
BassBass
35.4k4 gold badges86 silver badges205 bronze badges
answered 9 hours ago
BassBass
35.4k4 gold badges86 silver badges205 bronze badges
35.4k4 gold badges86 silver badges205 bronze badges
$begingroup$
Genius, thank you. Is there a name for this logic, such as swordfish? Or just logic? :)
$endgroup$
– Andrejs
8 hours ago
add a comment |
$begingroup$
Genius, thank you. Is there a name for this logic, such as swordfish? Or just logic? :)
$endgroup$
– Andrejs
8 hours ago
$begingroup$
Genius, thank you. Is there a name for this logic, such as swordfish? Or just logic? :)
$endgroup$
– Andrejs
8 hours ago
$begingroup$
Genius, thank you. Is there a name for this logic, such as swordfish? Or just logic? :)
$endgroup$
– Andrejs
8 hours ago
add a comment |
$begingroup$
The answer is
It is the only solution because it follows logically from placing an 8 on A7, and placing a 2 on A7 led to this contradiction for me (no 2 on row 8). Bass provides more intelligent reasoning for this step.
answered 9 hours ago
Joshua BizleyJoshua Bizley
38810 bronze badges
New contributor
Joshua Bizley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
The answer is
It is the only solution because it follows logically from placing an 8 on A7, and placing a 2 on A7 led to this contradiction for me (no 2 on row 8). Bass provides more intelligent reasoning for this step.
answered 9 hours ago
Joshua BizleyJoshua Bizley
38810 bronze badges
New contributor
Joshua Bizley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
The answer is
It is the only solution because it follows logically from placing an 8 on A7, and placing a 2 on A7 led to this contradiction for me (no 2 on row 8). Bass provides more intelligent reasoning for this step.
answered 9 hours ago
Joshua BizleyJoshua Bizley
38810 bronze badges
New contributor
Joshua Bizley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
The answer is
It is the only solution because it follows logically from placing an 8 on A7, and placing a 2 on A7 led to this contradiction for me (no 2 on row 8). Bass provides more intelligent reasoning for this step.
answered 9 hours ago
Joshua BizleyJoshua Bizley
38810 bronze badges
New contributor
Joshua Bizley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 9 hours ago
answered 9 hours ago
Joshua BizleyJoshua Bizley
38810 bronze badges
New contributor
Joshua Bizley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 9 hours ago
Joshua BizleyJoshua Bizley
38810 bronze badges
answered 9 hours ago
Joshua BizleyJoshua Bizley
38810 bronze badges
38810 bronze badges
New contributor
Joshua Bizley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Joshua Bizley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
Andrejs is a new contributor. Be nice, and check out our Code of Conduct.
Andrejs is a new contributor. Be nice, and check out our Code of Conduct.
Andrejs is a new contributor. Be nice, and check out our Code of Conduct.
Andrejs is a new contributor. Be nice, and check out our Code of Conduct.
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1
$begingroup$
It is often a mistake, but some sudoku puzzles have multiple solutions... I'll have a look though.
$endgroup$
– Joshua Bizley
9 hours ago
$begingroup$
Thank you, I've also just found this: puzzling.stackexchange.com/questions/252/…, from which I understood it's acceptable to make multiple assumptions on multiple cells (what I called "blind steps forward") and see if you come to a dead end or not...
$endgroup$
– Andrejs
9 hours ago
1
$begingroup$
It's not enough to see if you come to a dead end though; you'll need to see if the solution you found was unique; otherwise you'll end up claiming to have solved a sudoku that wasn't actually a sudoku.
$endgroup$
– Bass
9 hours ago
$begingroup$
Thank you, I guess I need to read up on solution uniqueness and what it means in the world of sudoku
$endgroup$
– Andrejs
9 hours ago