The New Sudoku Players' Forum

by **200e200w** » Fri Feb 16, 2018 9:32 am

Code: Select all: . 4 .|8 . 2|. 9 . 2 9 .|. 5 .|. 4 6 3 . .|4 . 6|. . 2 -----+-----+----- . . .|3 . 7|. . . 1 . .|. . .|. . 5 . . 9|. . .|6 . . -----+-----+----- 5 . 1|. . .|8 . 3 . 7 .|. . .|. 6 . . . .|1 6 3|. . .

200e200w

by **pjb** » Fri Feb 16, 2018 1:09 pm

Code: Select all: 67 4 567 | 8 3 2 | 157 9 17 2 9 8 | 7 5 1 | 3 4 6 3 1 57 | 4 9 6 | 57 8 2 ------------------------+----------------------+--------------------- b468 5 b246 | 3 248 7 | 249 1 c489 1 238b a247 | 6 248a 9 |A24 37c 5 478e 238 9 | 25 1 58 | 6 37d Bd8f-4 ------------------------+----------------------+--------------------- 5 6 1 | 9 7 4 | 8 2 3 49 7 3 | 25 28 58 | 149 6 149 489 28 b24 | 1 6 3 | 479 5 479

(4)r5c3 - (4=8)r4c1,r49c3 - r4c9 = (8-4)r6c9
(4-8)r5c5 = (8-3)r5c2* = r5c8 - (3=7)r6c8 - (78=4)r6c1* - r6c9
(4)r5c7 - r6c9 => -4 r6c9; stte

Phil

by **Cenoman** » Fri Feb 16, 2018 5:18 pm

Can't compete with Phil, so in three steps:

Code: Select all: +--------------------+------------------+-------------------+ | 67 4 567 | 8 3 2 | 157 9 17 | | 2 9 8 | 7 5 1 | 3 4 6 | | 3 1 57 | 4 9 6 | 57 8 2 | +--------------------+------------------+-------------------+ | 468 5 246 | 3 248 7 | 249 1 489 | | 1 b238 247 | 6 c248 9 | 24 37 5 | | 478 38-2 9 | e25 1 d58 | 6 37 48 | +--------------------+------------------+-------------------+ | 5 6 1 | 9 7 4 | 8 2 3 | | 49 7 3 | 25 28 58 | 149 6 149 | | 489 a28 24 | 1 6 3 | 479 5 479 | +--------------------+------------------+-------------------+

(2=8)r9c2 - r5c2 = r5c5 - (8=5)r6c6 - (5=2)r6c4 => -2 r6c2; 5 placements

Code: Select all: +--------------------+-----------------+-------------------+ | 67 4 567 | 8 3 2 | 157 9 17 | | 2 9 8 | 7 5 1 | 3 4 6 | | 3 1 57 | 4 9 6 | 57 8 2 | +--------------------+-----------------+-------------------+ | f468 5 a24-6 | 3 48 7 | b249 1 489 | | 1 238 247 | 6 48 9 | c24 37 5 | | e478 38 9 | 2 1 5 | 6 37 d48 | +--------------------+-----------------+-------------------+ | 5 6 1 | 9 7 4 | 8 2 3 | | f49 7 3 | 5 2 8 | 149 6 149 | | f489 28 24 | 1 6 3 | 479 5 479 | +--------------------+-----------------+-------------------+

(2)r4c3 = r4c7 - (2=4)r5c7 - r6c9 = r6c1 - (489=6)r489 => -6 r4c3; 13 placements

Code: Select all: +------------------+-----------------+-------------------+ | 7 4 6 | 8 3 2 | 5 9 1 | | 2 9 8 | 7 5 1 | 3 4 6 | | 3 1 5 | 4 9 6 | 7 8 2 | +------------------+-----------------+-------------------+ | 6 5 24 | 3 48 7 | 29+4 1 89+4 | | 1 28 7 | 6 48 9 | 24 3 5 | | 48 3 9 | 2 1 5 | 6 7 48 | +------------------+-----------------+-------------------+ | 5 6 1 | 9 7 4 | 8 2 3 | | 49 7 3 | 5 2 8 | 1 6 49 | | 89+4 28 24 | 1 6 3 | 49 5 7 | +------------------+-----------------+-------------------+

BUG+3: (4)r9c1==(4)r4c79 - (4=8)r6c9 - r6c1 = (8)r9c1 => -9 r1c1: stte

by **SteveG48** » Fri Feb 16, 2018 5:51 pm

Code: Select all: *------------------------------------------------------* | d67 4 567 | 8 3 2 | 157 9 17 | | 2 9 8 | 7 5 1 | 3 4 6 | | 3 1 57 | 4 9 6 | 57 8 2 | *------------------+----------------+------------------| |cd468 5 246 | 3 248 7 | a249 1 ab489 | | 1 f238 cd247 | 6 248 9 |abf24 37 5 | | e478 e238 9 |e25 1 e58 | 6 37 b8-4 | *------------------+----------------+------------------| | 5 6 1 | 9 7 4 | 8 2 3 | | 49 7 3 | 25 28 58 | 149 6 149 | | 489 28 24 | 1 6 3 | 479 5 479 | *------------------------------------------------------*

4b6p134 = (284*)b6p349 - (2|8)b4p16 = (XY-wing r1c1,b4p16) - (7|*4=2358)r6c1246 - (3|8=24)r5c27 => -4 r6c9 ; stte

200e200w's Nightmare #20