The New Sudoku Players' Forum

by **ArkieTech** » Sun Nov 17, 2013 12:20 am

Code: Select all: *-----------* |..5|...|...| |4..|..6|8.2| |.8.|.31|.6.| |---+---+---| |.3.|.6.|5..| |...|497|...| |..9|.8.|.4.| |---+---+---| |.4.|85.|.7.| |5.1|7..|..3| |...|...|4..| *-----------*

by **tlanglet** » Sun Nov 17, 2013 1:38 am

A Type 4 UR(39) makes a couple of deletions but does nothing significant. However, using the internal inferences completes the puzzle.......

Code: Select all: *-----------------------------------------------------------* | 69 679 5 | 2 4 8 | 3 1 79 | | 4 1 3 | 9 7 6 | 8 5 2 | | 29 8 27 | 5 3 1 | 79 6 4 | |-------------------+-------------------+-------------------| | 78 3 4 | 1 6 2 | 5 9 78 | | 168 5 68 | 4 9 7 | 2 3 168 | | 167 2 9 | 3 8 5 | 167 4 167 | |-------------------+-------------------+-------------------| |*2369 4 26 | 8 5 *39 | 169 7 169 | | 5 69 1 | 7 2 4 | 69 8 3 | |*389 79 78 | 6 1 *39 | 4 2 5 | *-----------------------------------------------------------*

AUR(39)r79c16 with internal references (26)r7c1, 8r9c1
(26)r7c1 => r7c1 <> 39
8r9c1-(8=72)r93c3-2r3c1=2r7c1 => r7c1 <> 39

Ted

by **Leren** » Sun Nov 17, 2013 3:01 am

Code: Select all: *--------------------------------------------------------------* | 69 c679 5 | 2 4 8 | 3 1 79 | | 4 1 3 | 9 7 6 | 8 5 2 | | 29 8 d7-2 | 5 3 1 | 79 6 4 | |--------------------+--------------------+--------------------| | 78 3 4 | 1 6 2 | 5 9 78 | | 168 5 68 | 4 9 7 | 2 3 168 | | 167 2 9 | 3 8 5 | 167 4 167 | |--------------------+--------------------+--------------------| | 2369 4 a26 | 8 5 39 | 169 7 169 | | 5 b69 1 | 7 2 4 | 69 8 3 | | 389 79 78 | 6 1 39 | 4 2 5 | *--------------------------------------------------------------*

H2 Wing: (2=6) r7c3 - r8c2 = (6-7) r1c2 = (7) r3c3 => - 2 r3c3; stte

Leren

by **pjb** » Sun Nov 17, 2013 3:42 am

Code: Select all: 69 69-7 5 | 2 4 8 | 3 1 79 4 1 3 | 9 7 6 | 8 5 2 29 8 a27 | 5 3 1 | 79 6 4 ---------------------+----------------------+--------------------- 78 3 4 | 1 6 2 | 5 9 78 168 5 68 | 4 9 7 | 2 3 168 167 2 9 | 3 8 5 | 167 4 167 ---------------------+----------------------+--------------------- 2369 4 b26 | 8 5 39 | 169 7 169 5 c69 1 | 7 2 4 | 69 8 3 389 d79 8-7 | 6 1 39 | 4 2 5

(7=2) r3c3 - (2=6) r7c3 - (6=9) r8c2 - (9=7) r9c2 => -7 r1c2, r9c3; stte

Phil

by **Marty R.** » Sun Nov 17, 2013 5:00 pm

Code: Select all: +-------------+--------+-----------+ | 69 679 5 | 2 4 8 | 3 1 79 | | 4 1 3 | 9 7 6 | 8 5 2 | | 29 8 27 | 5 3 1 | 79 6 4 | +-------------+--------+-----------+ | 78 3 4 | 1 6 2 | 5 9 78 | | 168 5 68 | 4 9 7 | 2 3 168 | | 167 2 9 | 3 8 5 | 167 4 167 | +-------------+--------+-----------+ | 2369 4 26 | 8 5 39 | 169 7 169 | | 5 69 1 | 7 2 4 | 69 8 3 | | 389 79 78 | 6 1 39 | 4 2 5 | +-------------+--------+-----------+

Play this puzzle online at the Daily Sudoku site

Short XY-Chain.

(6=2)r7c3-(2=7)r3c3-(7=9)r3c7-(9=6)r8c7=>r7c79<>6

by **Ngisa** » Mon Nov 18, 2013 11:34 am

Code: Select all: +-------------+--------+-----------+ | 69 7-69 5 | 2 4 8 | 3 1 79 | | 4 1 3 | 9 7 6 | 8 5 2 | | 29 8 27 | 5 3 1 | 79 6 4 | +-------------+--------+-----------+ | 78 3 4 | 1 6 2 | 5 9 78 | | 168 5 68 | 4 9 7 | 2 3 168 | | 167 2 9 | 3 8 5 | 167 4 167 | +-------------+--------+-----------+ | 236-9 4 26 | 8 5 39 | 169 7 169 | | 5 69 1 | 7 2 4 | 69 8 3 | | 38-9 79 78 | 6 1 39 | 4 2 5 | +-------------+--------+-----------+

DP 39 in r79c16; r79c1<>9 leads to
XY-Wing 67-27-26 pivoted in r3c3; r8c2<>6; stte.

Dan's Dilly-dally November 17, 2013