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23-Jul 2005 hard puzzle

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XForce

Joined: 23 Jul 2005
Posts: 2

Posted: Sat Jul 23, 2005 3:56 pm Post subject: 23-Jul 2005 hard puzzle

Code:

--3 -81 7X-
7-- 943 ---
81- 72- -Y-
-9- 462 -7-
4-- 357 --9
-7- 198 -4-
--- -7- -21
--7 219 --6
126 834 957

This is where I am stuck. The draw program says that there should be a 9 in slot X, however I can hardly see the logic behind this. I know X is one of the possibilities of the 9 being there, but however it can also go into slot Y. Anyone have any ideas>?

nero
Guest

Posted: Sat Jul 23, 2005 4:14 pm Post subject:

Code:

M-3 -81 7X-
7-- 943 ---
81- 72- -Y-
-9- 462 -7-
4-- 357 --9
M7- 198 -4-
--- -7- -21
--7 219 --6
126 834 957

Here is my logic: In the first column both 2 and 6 are limited to the two M positions. Therefore the top left position in the top left square is either a 2 or a 6 and cannot be a 9. Once that one is blocked off the X position is the only remaining position in the first row to put a 9.

XForce

Joined: 23 Jul 2005
Posts: 2

Posted: Sat Jul 23, 2005 4:53 pm Post subject:

Ah that makes sense, thank you. Getting that 9 in the X slot helps immensely to solving the entire puzzle

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