Robert's puzzles 2020-01-01

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Robert's puzzles 2020-01-01

Postby Mauriès Robert » Wed Jan 01, 2020 12:34 pm

Hi all and Happy New Year 2020 !
This is my first grid of the year, not too difficult.
..31......9..7..8...8..2..51..5.......2.3.4.......7..89..4..8...3..6..1......57..
Good sudoku.
Robert
puzzle: Show
Image
Mauriès Robert
 
Posts: 222
Joined: 07 November 2019
Location: France

Re: Robert's puzzles 2020-01-01

Postby eleven » Wed Jan 01, 2020 7:52 pm

Code: Select all
 *-------------------------------------------------------------------------*
 |  2467   2467    3      |  1     5      8     |  269     24679   24679   |
 |  2456   9       1456   |  36    7      346   |  1236    8       12346   |
 |  467    1467    8      |  369   49     2     |  136     3467    5       |
 |------------------------+---------------------+--------------------------|
 |  1      4678    4679   |  5     2489   46    |  2369    23679   23679   |
 |  567    5678    2      |  689   3      6-1   |  4      b5679   d1679    |
 |  3      456     4569   |  269   1249   7     | c12569  b2569    8       |
 |------------------------+---------------------+--------------------------|
 |  9      12567   1567   |  4     12    a13    |  8      a356    a36      |
 |  8      3       45     |  7     6      9     |  25      1       24      |
 |  246    1246    146    |  238   128    5     |  7       3469    3469    |
 *-------------------------------------------------------------------------*

(1=365)r7c689 - r56c8 = (5-1)r6c7 = r5c9 => -1r5c6, solves with xyz-wing
eleven
 
Posts: 2238
Joined: 10 February 2008

Re: Robert's puzzles 2020-01-01

Postby Mauriès Robert » Thu Jan 02, 2020 7:02 am

Hi,
Here's my two-step resolution with TDP:
1) P'(1r7c6) : -1r7c6->(3r7c6->6r7c9)->5r7c8->5r6c7->1r5c9 => -1r5c6 => 23 placements.
2) P'(5r6c8) : -5r8c6->6r6c8->4r9c8->2r8c9->5r8c7 => -5r6c7 => stte.
Robert
Mauriès Robert
 
Posts: 222
Joined: 07 November 2019
Location: France


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