The New Sudoku Players' Forum

by **ArkieTech** » Sun Jan 07, 2018 12:04 pm

Code: Select all: *-----------* |..8|7..|53.| |...|1..|82.| |.1.|..5|..4| |---+---+---| |.7.|..1|..9| |..4|.7.|6..| |1..|5..|.8.| |---+---+---| |9..|4..|.6.| |.41|..2|...| |.23|..7|9..| *-----------*

by **rjamil** » Sun Jan 07, 2018 1:02 pm

Code: Select all: ..87..53....1..82..1...5..4.7...1..9..4.7.6..1..5...8.9..4...6..41..2....23..79..

After 22 singletons:

Code: Select all: +------------+---------------+--------+ | 4 69 8 | 7 2 69 | 5 3 1 | | 7 39 5 | 1 349 349 | 8 2 6 | | 236 1 26 | 368 368 5 | 7 9 4 | +------------+---------------+--------+ | 2368 7 26 | 2368 368 1 | 4 5 9 | | 258 58 4 | 289 7 89 | 6 1 3 | | 1 36 9 | 5 346 346 | 2 8 7 | +------------+---------------+--------+ | 9 58 7 | 4 358 38 | 1 6 2 | | 568 4 1 | 689 5689 2 | 3 7 58 | | 568 2 3 | 68 1 7 | 9 4 58 | +------------+---------------+--------+

1. Pointing and claiming intersection removal b7c1 Clue 6;
2. Row wise Sword Fish Cells r267c256 Clue 3;
3. Naked pair r34c5 Clues 68;
4. Pointing and claiming intersection removal b8c4 Clue 6;
5. Row wise Jelly Fish Cells r3489c1459 Clue 8;
6. XY-Wings r5c6, r4c5, r1c6 Clue 6; stte.

Too many easy steps.

R. Jamil

by **Sudtyro2** » Sun Jan 07, 2018 3:40 pm

Code: Select all: +---------------+-----------------+--------------+ | 4 69 8 | 7 2 69 | 5 3 1 | | 7 39 5 | 1 349 349 | 8 2 6 | | 23 1 26 | 368 368 5 | 7 9 4 | +---------------+-----------------+--------------+ | 238 7 26 | 2368 368 1 | 4 5 9 | | 258 58 4 | 28-9 7 89 | 6 1 3 | | 1 36 9 | 5 346 346 | 2 8 7 | +---------------+-----------------+--------------+ | 9 58 7 | 4 358 38 | 1 6 2 | | 568* 4 1 | 689* 568-9 2 | 3 7 58* | | 568* 2 3 | 68* 1 7 | 9 4 58* | +---------------+-----------------+--------------+

Almost DP(568)r89c149, using the single internal.
9r8c4 => -9r5c4,r8c5; stte.

Does seem too easy. Did I miss something?

SteveC

by **Cenoman** » Sun Jan 07, 2018 5:16 pm

Code: Select all: +------------------+----------------------+-----------------+ | 4 69 8 | 7 2 69 | 5 3 1 | | 7 a39 5 | 1 349* 349* | 8 2 6 | | C23 1 26 | D368 368 5 | 7 9 4 | +------------------+----------------------+-----------------+ | B238 7 b26 | E368-2 368 1 | 4 5 9 | | 258 58 4 | 289 7 89 | 6 1 3 | | 1 Ab36 9 | 5 346* 346* | 2 8 7 | +------------------+----------------------+-----------------+ | 9 58 7 | 4 358 38 | 1 6 2 | | 568 4 1 | 689 5689 2 | 3 7 58 | | 568 2 3 | 68 1 7 | 9 4 58 | +------------------+----------------------+-----------------+

UR(34)r26c56 using externals (r2 & r6)
(3)r2c2 - (3=2)b4p38
(3)r6c2 - r4c1 = r3c1 - r3c4 = r4c4
=> -2 r4c4; stte

EDIT:

Sudtyro2 wrote:Almost DP(568)r89c149, using the single internal.
9r8c4 => -9r5c4,r8c5; stte.

Does seem too easy. Did I miss something?

Steve's solution is nice !
To me, nothing missed. (568)r89c149, considered as a MUG, is a DP, and it is correct to process the single internal of the DP.

by **SteveG48** » Sun Jan 07, 2018 6:36 pm

Code: Select all: *-----------------------------------------------------------* | 4 69 8 | 7 2 69 | 5 3 1 | | 7 39 5 | 1 349 349 | 8 2 6 | |b23 1 26 | 368 368 5 | 7 9 4 | *-------------------+-------------------+-------------------| |b238 7 26 | 2368 368 1 | 4 5 9 | |a258 a58 4 | 28-9 7 a89 | 6 1 3 | | 1 36 9 | 5 346 346 | 2 8 7 | *-------------------+-------------------+-------------------| | 9 58 7 | 4 358 38 | 1 6 2 | |c568 4 1 |c689 5689 2 | 3 7 c58 | |c568 2 3 |c68 1 7 | 9 4 c58 | *-----------------------------------------------------------*

A variant on SteveC's:

(9=258)r5c126 - (2=38)r34c1 - (8r89c1= 9r8c4)[568DP r89c149] => -9 r5c4 ; stte

by **Leren** » Sun Jan 07, 2018 7:31 pm

Code: Select all: *-------------------------------------* | 4 69 8 | 7 2 69 | 5 3 1 | | 7 39 5 | 1 349 349 | 8 2 6 | |a23 1 26 |b368 368 5 | 7 9 4 | |------------+---------------+--------| | 238 7 26 |c2368 368 1 | 4 5 9 | | 58-2 58 4 |d289 7 89 | 6 1 3 | | 1 36 9 | 5 346 346 | 2 8 7 | |------------+---------------+--------| | 9 58 7 | 4 358 38 | 1 6 2 | | 568 4 1 | 689 5689 2 | 3 7 58 | | 568 2 3 | 68 1 7 | 9 4 58 | *-------------------------------------*

M Wing Type 2A : (2=3) r3c1 - 3c4 = (3-2) r4c4 = (2) r5c4 => - 2 r5c1; stte

Leren

by **Leren** » Sun Jan 07, 2018 7:41 pm

rjamil wrote : Too many easy steps.

For your information, a fun convention we have been following for years (for Dan's daily puzzles) is to solve them with one non-Basic move.

"Basics" includes singles, pointing and claiming intersections, plus naked and hidden tuples.

One quirk of this convention is that ordinary Fish are never used. Other varieties, such as Finned, Franken and Mutant Fish count as a non-basic move.

Leren

by **pjb** » Sun Jan 07, 2018 8:51 pm

Code: Select all: 4 69 8 | 7 2 69 | 5 3 1 7 39 5 | 1 349 349 | 8 2 6 a23 1 26 |b368 368 5 | 7 9 4 ------------------------+----------------------+--------------------- 238 7 26 | 2368 368 1 | 4 5 9 58-2 58 4 |b289 7 89 | 6 1 3 1 36 9 | 5 346 346 | 2 8 7 ------------------------+----------------------+--------------------- 9 58 7 | 4 358 38 | 1 6 2 568 4 1 |b689 5689 2 | 3 7 58 568 2 3 |b68 1 7 | 9 4 58

(2=3)r3c1 - (3=2)r3589c4 => -2 r5c1; stte

Phil

by **Marty R.** » Sun Jan 07, 2018 9:51 pm

Code: Select all: ┌────────────────────┬────────────────────┬────────────────────┐ │ 4 69 8 │ 7 2 69 │ 5 3 1 │ │ │ │ │ │ 7 39 5 │ 1 349 349 │ 8 2 6 │ │ │ │ │ │ 23 1 26 │ 368 368 5 │ 7 9 4 │ ├────────────────────┼────────────────────┼────────────────────┤ │ 238 7 26 │ 2368 368 1 │ 4 5 9 │ │ │ │ │ │ 258 58 4 │ 289 7 89 │ 6 1 3 │ │ │ │ │ │ 1 36 9 │ 5 346 346 │ 2 8 7 │ ├────────────────────┼────────────────────┼────────────────────┤ │ 9 58 7 │ 4 358 38 │ 1 6 2 │ │ │ │ │ │ 568 4 1 │ 689 5689 2 │ 3 7 58 │ │ │ │ │ │ 568 2 3 │ 68 1 7 │ 9 4 58 │ └────────────────────┴────────────────────┴────────────────────┘

DP (56-68-58)r89c149 internals
8r89c1=9r8c4
8r89c1-r7c2=r5c2-(8=9)r5c9
9r8c4-r5c4=r5c9=> 9r5c9

by **SteveG48** » Sun Jan 07, 2018 11:51 pm

Leren wrote:
rjamil wrote : Too many easy steps.

For your information, a fun convention we have been following for years (for Dan's daily puzzles) is to solve them with one non-Basic move.

"Basics" includes singles, pointing and claiming intersections, plus naked and hidden tuples.

One quirk of this convention is that ordinary Fish are never used. Other varieties, such as Finned, Franken and Mutant Fish count as a non-basic move.

Leren

And, for what it's worth, we define "solve" as reducing the puzzle to singles (stte, singles to the end) or basics (lclste, locked candidates, locked sets to the end) after the one move. Some players prefer stte solutions to lclste solutions, some don't. Matter of taste. The most important thing is- enjoy! If you fancy a solution that doesn't follow our little convention, by all means post it.

Welcome.

by **Ngisa** » Mon Jan 08, 2018 1:06 pm

Code: Select all: +---------------------+---------------------------+------------------+ | 4 69 8 | 7 2 d69 | 5 3 1 | | 7 39 5 | 1 c349 c349 | 8 2 6 | | 23 1 26 | b368 368 5 | 7 9 4 | +---------------------+---------------------------+------------------+ | 238 7 26 | 2368 368 1 | 4 5 9 | | 258 58 4 | 289 7 e89 | 6 1 3 | | 1 36 9 | 5 346 346 | 2 8 7 | +---------------------+---------------------------+------------------+ | 9 g58 7 | 4 h358 f38 | 1 6 2 | | 568 4 1 | a689 i568-9 2 | 3 7 58 | | 568 2 3 | a68 1 7 | 9 4 58 | +---------------------+---------------------------+------------------+

(9=68)r89c4 - (68=3)r3c4 - (3=49)r2c56 - (9)r1c6 = (9-8)r5c6 = r7c6 - (8=5)r7c2 - r7c5 = (5)r8c5 => - 9 r8c5; stte

Clement

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