tatamiusuka
Sudoku Player
Registered: 04/14/10
Posts: 1
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| | 04/14/10 at 02:40 AM | Reply with quote | #1 |
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As topic, I wan to know the way how you going to solve this...I have already spam more that 1hours in here but still cant get the answer...can you help me solve this and tell me step by step how and why you can confirm the number is there..
Thank alot for reading...
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Rob
Sudoku Master
Registered: 05/01/08
Posts: 302
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| | 04/14/10 at 02:15 PM | Reply with quote | #2 |
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Two ways of proceeding that I can see: a y wing or a BUG.
The y wing consists of the 39 in r2c1, the 35 in r2c4, and the 59 in r3c3.
Basically, if r2c1 is a 3, then r2c4 must be a 5.
And if r2c1 is a 9, then r3c3 must be a 5.
So one or other of r2c4 and r3c3 MUST be a 5, and therefore r2c2 CANNOT be a 5.
The BUG is easier (if you've seen the technique before anyway) and is explained here:
http://www.brainbashers.com/sudokubugremoval.asp
In this example you'd end up realising that r1c2 must be a 5. |
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SudokuStrategies
Sudoku Player
Registered: 04/30/10
Posts: 4
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