Sudoku Chains
can anyone solve this sudoku puzzle?
900004500
020900001
003702090
100020800
050000004
000009070
600200000
080000006
007090030
its a cellphone generated puzzles. I am not new to sudoku. My fastest time on professional was 7:30. It is just I am sick of skipping through puzzles like this. I was just wondering if there was even a solution to this. The zero stands for blank (no answers yet). I answered some of the obvious ones and I dont think I made any mistakes. Please tell me the first number and its position that you come up with to solve the puzzle and how you arrive to that number> I know that one number is often enough to lead to a series of chain effect that can solve the puzzle.
original puzzle without me answering it yet. If you want to check if I made any mistakes
900004500
020000001
003700090
100020800
050000004
000009070
600200000
080000006
007090030
On the top row the last but one number is a 2 (ie 900004520)
The reasoning for this is:
Numbers 3 and 7 are in both column 8 and row 3 already. Therefore the only places that both these numbers can go in the top right square of nine are in positions Row 1 column 9 and row 2 column 7. Therefore no other numbers can be in either of these spaces (either a 3 or a 7 are in them).
Therefore as 2 is already in rows 2 and 3 it has to be in either Row 1 columns 8 or 9, but we have just determined that either 3 or 7 is in row 1 column 9. Therefore 2 must be in Row 1 column 8
This in turn means that Row 3 column 9 has to be an 8
(it can’t be the others)
This then means Row 7 column 8 also has to be an 8
After this it gets more complicated but there are a number of spaces that are 50/50. I think it will be necessary to make an assumption and work it through until it is wrong – in which case then change the initial 50/50 assumption to the alternative. Unfortunately I don’t have enough time. Good luck with it!
How to Solve Sudoku Puzzles : Swordfish Strategy in Sudoku
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