20 oktober

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20 oktober

Postby Sudoku123456789 » Fri Oct 20, 2017 11:53 am

Multiple techniques?
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Re: 20 oktober

Postby Sudoku123456789 » Fri Oct 20, 2017 12:39 pm

Already confirmed 3R7C9
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Re: 20 oktober

Postby Sudoku123456789 » Fri Oct 20, 2017 1:26 pm

I was thinking about a hidden rectangle 58 at R89C67. Is this correct?
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Re: 20 oktober

Postby Sudoku123456789 » Fri Oct 20, 2017 4:32 pm

Solved with a few XYZ-wings:

Pivot R9C6 (358), pincers R8C5 (38) + R9C7 (58) -> -8R8C7 (most likely not necessary)
Pivot R7C4 (469), pincers R8C4 (46) + R7C8 (49) -> -4R8C8

A 3rd one which leads to stte. Unfortunately can't find it anymore and did not document on that moment. Beautiful challenge for you.

Found my mistake: when i restarted i forgot to fill in the 3.

Last XYZ-wing

Pivot R9C9 (479), pincers R9C4 (49) + R8C9 (47) -> -4R8C4; stte
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Re: 20 oktober

Postby Leren » Fri Oct 20, 2017 8:29 pm

The puzzle in line format : .9....3.8..359.6........7....28....5.1.3.....4....6.815...27.....9..........1..6.

This puzzle solves with basics only : pointing pairs/triples and naked pairs. Checked with my solver and Hodoku.

Leren
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Re: 20 oktober

Postby Sudoku123456789 » Fri Oct 20, 2017 9:17 pm

Which solver do you use (and is it available for mac)?

Did not see any remaining point pairs/triples + naked pairs... this is the first thing I always look for.
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Re: 20 oktober

Postby Leren » Fri Oct 20, 2017 9:49 pm

You can download the Hodoku solver from here, or use Andrew Stuarts solver here.

To use Andrew's solver click on the red Clear button above the small grid on the left and enter your clues in that grid.

If you look at your puzzle status diagram, there is an obvious naked pair (48) in r7c2 and r9c3, which removes 6 candidates in Box 7.

This unearth's another naked pair (27) in r89c2, which removes 6 candidates in r89c1 and r2c2 and solves two more cells in r29c1.

Then another naked pair (58) in r9c67 removes the 8 from r9c3, solves that cell and the rest of the puzzle with follow-on singles.

Leren
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Re: 20 oktober

Postby Sudoku123456789 » Sat Oct 21, 2017 10:00 am

O... :|
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