The New Sudoku Players' Forum

by **SteveG48** » Fri Jun 24, 2022 1:10 pm

Code: Select all: *-----------* |..3|48.|.91| |...|7.3|8.4| |.1.|...|...| |---+---+---| |...|..4|..7| |..6|...|5..| |7..|3..|...| |---+---+---| |..5|...|.8.| |3.7|..1|...| |89.|.56|...| *-----------*

by **Cenoman** » Fri Jun 24, 2022 4:28 pm

Three simple steps:

Code: Select all: +----------------------+--------------------+------------------------+ | *256 7 3 | 4 8 *25 | 26 9 1 | | 2569 26-5 29 | 7 1 3 | 8 256 4 | | 4 1 8 | 56 269 259 | 37 37 25 | +----------------------+--------------------+------------------------+ | 129-5 8 129 | 56 269 4 | 12369 1236 7 | | 29 3 6 | 1 7 289 | 5 4 289 | | 7 *245 1249 | 3 269 *2589 | 1269 126 2689 | +----------------------+--------------------+------------------------+ | 126 246 5 | 9 3 7 | 14 8 26 | | 3 26 7 | 8 4 1 | 269 256 2569 | | 8 9 14 | 2 5 6 | 147 17 3 | +----------------------+--------------------+------------------------+

1. Skyscraper: (5)r1c1 = r1c6 - r6c6 = r6c2 => -5 r2c2, r4c1; 14 placements

Code: Select all: +-------------------+-------------------+---------------------+ | 256 7 3 | 4 8 25 | 26 9 1 | | 569-2 *26 *29 | 7 1 3 | 8 *256 4 | | 4 1 8 | 6 29 259 | 7 3 25 | +-------------------+-------------------+---------------------+ | 1 8 *29 | 5 69-2 4 | 3 *26 7 | | 29 3 6 | 1 7 289 | 5 4 289 | | 7 5 4 | 3 269 289 | 269 1 2689 | +-------------------+-------------------+---------------------+ | 26 4 5 | 9 3 7 | 1 8 26 | | 3 *26 7 | 8 4 1 | 69-2 *256 569-2 | | 8 9 1 | 2 5 6 | 4 7 3 | +-------------------+-------------------+---------------------+

2. Swordfish (2)c238\r248 => -2 r2c1, r4c5, r8c79

Code: Select all: +------------------+-------------------+---------------------+ | 256 7 3 | 4 8 25 | 26 9 1 | | 569 *26 *29 | 7 1 3 | 8 25-6 4 | | 4 1 8 | 6 29 259 | 7 3 25 | +------------------+-------------------+---------------------+ | 1 8 *29 | 5 69 4 | 3 *26 7 | | 29 3 6 | 1 7 289 | 5 4 289 | | 7 5 4 | 3 269 289 | 269 1 2689 | +------------------+-------------------+---------------------+ | 26 4 5 | 9 3 7 | 1 8 26 | | 3 26 7 | 8 4 1 | 69 256 569 | | 8 9 1 | 2 5 6 | 4 7 3 | +------------------+-------------------+---------------------+

3. W-Wing: (6=2)r2c2 - r2c3 = r4c3 - (2=6)r4c8 => -6 r2c8; ste

by **RSW** » Fri Jun 24, 2022 8:11 pm

1. Sashimi X-wing (5)r14c16 fin r4c4
2. Swordfish (2)r248c238
3. Two more Sashimi X-wings (6)r17c17 fin r7c9, (2)r36c57 fin r1c7
stte

by **Leren** » Fri Jun 24, 2022 8:51 pm

Code: Select all: *-------------------------------------------------* |b256 7 3 | 4 8 a25 | 26 9 1 | | 2569 256 29 | 7 1 3 | 8 256 4 | | 4 1 8 | 56 269 259 | 37 37 25 | |---------------+---------------+-----------------| |c1259 8 129 |d56 269 4 | 12369 1236 7 | | 29 3 6 | 1 7 289 | 5 4 289 | | 7 245 1249 | 3 269 289-5 | 1269 126 2689 | |---------------+---------------+-----------------| | 126 246 5 | 9 3 7 | 14 8 26 | | 3 26 7 | 8 4 1 | 269 256 2569 | | 8 9 14 | 2 5 6 | 147 17 3 | *-------------------------------------------------*

1. Skyscraper : (5) r1c6 = r1c1 - r4c1 = (5) r4c4 => - 5 r6c6; basics

Code: Select all: *-------------------------------------------* | 256 7 3 | 4 8 25 | 26 9 1 | | 2569 26 29 | 7 1 3 | 8 256 4 | | 4 1 8 | 6 tf29 259 | 7 3 5-2 | |------------+--------------+---------------| | 1 8 29 | 5 269 4 | 3 26 7 | |*29 3 6 | 1 7 f289 | 5 4 *289 | | 7 5 4 | 3 269 289 | 269 1 2689 | |------------+--------------+---------------| |*26 4 5 | 9 3 7 | 1 8 *26 | | 3 26 7 | 8 4 1 | 269 256 2569 | | 8 9 1 | 2 5 6 | 4 7 3 | *-------------------------------------------*

2. Finned X Wing (2) r57c17 fin Cell r5c6 transported to r3c5 => - 2 r3c9; stte

Leren

by **Hajime** » Sat Jun 25, 2022 11:50 am

3 Skyscrapers and 1 Swordfish

Hidden Text: Show

Code: Select all: [1,1] r9c4=2 Naked Single [1,2] r9c9=3 Naked Single [2,3] r7c4=9 Naked Single [2,4] r7c6=7 Naked Single [2,5] r8c4=8 Naked Single [2,6] r8c5=4 Naked Single [3,7] r5c4=1 Naked Single [3,8] r7c5=3 Naked Single [4,9] r2c5=1 Hidden Single in row 2 [4,10] r3c3=8 Hidden Single in row 3 [4,11] r4c2=8 Hidden Single in row 4 [4,12] r5c5=7 Hidden Single in row 5 [4,13] r5c2=3 Hidden Single in col 2 [4,14] r1c2=7 Hidden Single in col 2 [4,15] r3c1=4 Hidden Single in box 1 [5,16] r5c8=4 Hidden Single in row 5 [6,16] NakedTriple (256)b3e159 => (-26)r3c7 (-256)r3c8 [7,16] Pointing, Claiming | (6)b2r3 => (-6)r3c9 [8,16] Skyscraper (5)r1c1=r1c6-r6c6=r6c2 => (-5)r4c1 (-5)r2c2 [9,17] r4c4=5 Hidden Single in row 4 [9,18] r6c2=5 Hidden Single in row 6 [9,19] r7c2=4 Hidden Single in col 2 [9,20] r6c3=4 Hidden Single in col 3 [9,21] r3c4=6 Hidden Single in col 4 [9,22] r9c7=4 Hidden Single in col 7 [9,23] r3c7=7 Hidden Single in col 7 [9,24] r9c8=7 Hidden Single in col 8 [9,25] r3c8=3 Hidden Single in box 3 [9,26] r4c7=3 Hidden Single in box 6 [9,27] r7c7=1 Hidden Single in box 9 [10,28] r9c3=1 Naked Single [11,29] r6c8=1 Hidden Single in row 6 [11,30] r4c1=1 Hidden Single in col 1 [12,30] Skyscraper (6)r1c7=r1c1-r7c1=r7c9 => (-6)r8c7 [13,30] Swordfish (2)c238r248 => (-2)r2c1 (-2)r4c5 (-2)r8c7 (-2)r8c9 [14,31] r8c7=9 Naked Single [15,31] NakedPair (26)b6e27 => (-2)r5c9 (-26)r6c9 [16,31] Pointing, Claiming | (6)c9b9 => (-6)r8c8 [17,31] Skyscraper (2)r1c7=r6c7-r6c5=r3c5 => (-2)r1c6 (-2)r3c9 [18,32] r1c6=5 Naked Single [18,33] r3c9=5 Naked Single [18,34] r8c9=6 Naked Single [19,35] r7c9=2 Naked Single [19,36] r8c2=2 Naked Single [19,37] r8c8=5 Naked Single [20,38] r2c2=6 Naked Single [20,39] r2c8=2 Naked Single [20,40] r4c8=6 Naked Single [20,41] r6c7=2 Naked Single [20,42] r7c1=6 Naked Single [21,43] r1c1=2 Naked Single [21,44] r1c7=6 Naked Single [21,45] r2c3=9 Naked Single [21,46] r4c3=2 Naked Single [21,47] r4c5=9 Naked Single [21,48] r5c1=9 Naked Single [21,49] r5c9=8 Naked Single [21,50] r6c5=6 Naked Single [21,51] r6c6=8 Naked Single [21,52] r6c9=9 Naked Single [22,53] r2c1=5 Naked Single [22,54] r3c5=2 Naked Single [22,55] r3c6=9 Naked Single [22,56] r5c6=2 Naked Single

by **jco** » Sat Jun 25, 2022 12:27 pm

After basics

Code: Select all: .--------------------------------------------------------------------. |a256 7 3 | 4 8 b25 | 26 9 1 | | 2569 26-5 29 | 7 1 3 | 8 256 4 | | 4 1 8 | 56 269 259 | 37 37 25 | |----------------------+----------------------+----------------------| | 129-5 8 129 | 56 269 4 | 12369 1236 7 | | 29 3 6 | 1 7 289 | 5 4 289 | | 7 d245 1249 | 3 269 c2589 | 1269 126 2689 | |----------------------+----------------------+----------------------| | 126 246 5 | 9 3 7 | 14 8 26 | | 3 26 7 | 8 4 1 | 269 256 2569 | | 8 9 14 | 2 5 6 | 147 17 3 | '--------------------------------------------------------------------'

1. (5)r1c1 = (5)r1c6 - (5)r6c6 = (5)r5c2 => -5 r2c2, -5 r4c1 (& singles)
----

Code: Select all: .------------------------------------------------------------. | 256 7 3 | 4 8 25 | 26 9 1 | | 2569 fa26 9-2 | 7 1 3 | 8 f256 4 | | 4 1 8 | 6 29 259 | 7 3 e25 | |--------------------+-------------------+-------------------| | 1 8 29 | 5 269 4 | 3 26 7 | | 29 3 6 | 1 7 289 | 5 4 289 | | 7 5 4 | 3 269 289 | 269 1 2689 | |--------------------+-------------------+-------------------| |c26 4 5 | 9 3 7 | 1 8 d26 | | 3 b26 7 | 8 4 1 | 269 256 2569 | | 8 9 1 | 2 5 6 | 4 7 3 | '------------------------------------------------------------'

2. (2)r2c2 = (2)r8c2 - (2)r7c1 = (2)r7c9 - (2=5)r3c9 - (5=62)r2c29 => -2 r2c3; ste

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