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WSPC Organizer
Posts: 739
  
Location: India | sinchai4547 - 2017-10-05 8:36 PM
For Confused knights Sudoku
is there more solution (5 and 9 in cells r1c1 r3c1 and r1c4 r3c4)? or i miss some rule.
'5' is present in a shaded cell, like R5C7 or R6C6. Hence, no two '5's can be placed at knight's step away from each other.
There is a '5' in R4C3, so there cannot be a '5' in R3C1.
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Odd Even & Twisted Classics (SM 16/17) Author
Posts: 460
Location: India | In the IB Example, I am getting multiple solution for the Maximum Arrow Sudoku. Am I missing any rule/constraint here. The 2 and 6 in R1 and R9 are interchangeable. |
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WSPC Organizer
Posts: 739
Location: India | purifire - 2017-10-06 5:40 PM
In the IB Example, I am getting multiple solution for the Maximum Arrow Sudoku. Am I missing any rule/constraint here. The 2 and 6 in R1 and R9 are interchangeable.
R5C5 = 6 with a circle. If you swap the 2s and 6s in R1 and R9, that arrow with '6' won't be satisfied.
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Odd Even & Twisted Classics (SM 16/17) Author
Posts: 460
Location: India | vopani - 2017-10-06 10:16 PM
purifire - 2017-10-06 5:40 PM
In the IB Example, I am getting multiple solution for the Maximum Arrow Sudoku. Am I missing any rule/constraint here. The 2 and 6 in R1 and R9 are interchangeable.
R5C5 = 6 with a circle. If you swap the 2s and 6s in R1 and R9, that arrow with '6' won't be satisfied.
Why cant I have a 6 in R1C9? How does it negate the condition? |
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WSPC Organizer
Posts: 739
Location: India | purifire - 2017-10-06 10:19 PM
vopani - 2017-10-06 10:16 PM
purifire - 2017-10-06 5:40 PM
In the IB Example, I am getting multiple solution for the Maximum Arrow Sudoku. Am I missing any rule/constraint here. The 2 and 6 in R1 and R9 are interchangeable.
R5C5 = 6 with a circle. If you swap the 2s and 6s in R1 and R9, that arrow with '6' won't be satisfied.
Why cant I have a 6 in R1C9? How does it negate the condition?
R1C9 must be '6', as in the solution.
If you swap R1C7 and R1C9, and corresponding R9C7 and R9C9, the arrow starting at R5C5 with a '6' would have digits 3, 3, 5, 2 along its arrow, and hence, does not satisfy the 'maximum' rule.
If its still not clear, it would help if you could share your solution which doesn't match the one in the IB.
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SM 2020 (Math) Author
Posts: 157
Location: India | Rhombus Sudoku
Is it necessary that there will be 9 rhombus and that each rhombus will have 9 different numbers in the middle ? |
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WSPC Organizer
Posts: 739
Location: India | akash.doulani - 2017-10-08 1:15 PM
Rhombus Sudoku
Is it necessary that there will be 9 rhombus and that each rhombus will have 9 different numbers in the middle ?
No.
That is just the theme of the IB example :-)
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