The New Sudoku Players' Forum

by **urhegyi** » Sun Mar 07, 2021 11:45 pm

Yes, my first 8 clues example. It took some preparation but the result has a nice form too.

Code: Select all: #1/WX/B4,JS ...........3...2......4..............5.....9..............7......8...1........... 111111223441112233444222233444525533664555733665585777668888777668899977688999999

Can you give the SE rating for jigsawexplainer?(SiSeSuSo estimates this around 7.5)

solution:

Hidden Text: Show

hints found by SiSeSuSo:

Hidden Text: Show

by **1to9only** » Mon Mar 08, 2021 12:48 am

Code: Select all: ...........3...2......4..............5.....9..............7......8...1........... 111111223441112233444222233444525533664555733665585777668888777668899977688999999 JSWX 8 ED=7.2/2.9/2.6

Code: Select all: Difficulty rating: 7.2 This Windoku Jigsaw can be solved using the following logical methods: 70 x Hidden Single (1.0-1.5) 1 x Direct Claiming (1.9) 1 x Direct Hidden Pair (2.0) 1 x Direct Hidden Triplet (2.5) 23 x Cage Pointing (2.6) 36 x Claiming (2.8) 44 x Generalized Intersection (2.9) 4 x Hidden Pair (3.4) 1 x Forcing Chain (7.2)

by **1to9only** » Mon Mar 08, 2021 10:36 am

This JSWX layout is rather good at producing 8-clues:

Code: Select all: ...............2...8.............7.........9..........6....4...........51........ JSWX ED=2.9/1.5/1.5 ..........1..8..4....................5.....9....................7..2..3.......... JSWX ED=2.9/2.3/2.3 ........3...5.......27.....................................48.......9...1........ JSWX ED=4.2/2.9/2.6 ..........1.....4.............9.8...............2.5.............7.....3.......... JSWX ED=7.7/2.3/2.3 ....9.....1.....4...................2.......8...................7.....3.....5.... JSWX ED=7.9/2.3/2.3 .....................7.3......9.8...............2.5......1.4..................... JSWX ED=8.1/8.1/2.9 ....9........8.......7.3.................................1.4.......2........5.... JSWX ED=8.8/8.8/2.6 7..........3.......8....9...............................5....2.......1..........4 JSWX ED=8.9/8.9/2.6 111111223441112233444222233444525533664555733665585777668888777668899977688999999

Same solution grid: Show

by **urhegyi** » Mon Mar 08, 2021 4:03 pm

It's most of all the number 6 which is missing. Except for your first example where the number three is missing. All the other numbers occur only once.
A few easy ones for the p&p solvers:

Code: Select all: .............8.................1.....57...49.....3.................2............. ..............................918.....7...4.....235.............................. 7.......3....8.......................5.....9.......................2....1.......4 ...........3...2.....................57...49.....................8...1........... ..........1.....4...................25.....98...................7.....3.......... ...............................1....257...498....3............................... ..........1..8..4....................5.....9....................7..2..3.......... ..1...5......8........................7...4........................2......9...3.. ..............................9.8.....73.14.....2.5..............................

Code: Select all: 111111223441112233444222233444525533664555733665585777668888777668899977688999999

by **urhegyi** » Mon Mar 08, 2021 4:59 pm

I found one with each number occuring only once, so 9 clues. After removing the 6 at R5C5 I got a 8 clues JSWX and backtracking confirms 1 solution, so it's valid, but I have no idea of the rating. It must be hard.

Code: Select all: #1/WX/B4,JS ....9......3...2......4...................................7......8...1......5.... 111111223441112233444222233444525533664555733665585777668888777668899977688999999

by **1to9only** » Tue Mar 09, 2021 12:17 am

Code: Select all: ....9......3...2......4...................................7......8...1......5.... 111111223441112233444222233444525533664555733665585777668888777668899977688999999 JSWX 8 ED=9.1/9.1/2.6

urhegyi wrote:It's most of all the number 6 which is missing. Except for your first example where the number three is missing. All the other numbers occur only once.

This is probably just a coincidence! I've generated a few others where the 6 appears more often.

Code: Select all: ........3...58.......7.....................................4.......29...1........ JSWX 8 ED=2.8/1.2/1.2 7.......3....8.......................5.....9.......................2....1.......4 JSWX 8 ED=2.8/2.3/2.3 ..........1..8..4....................5.....9....................7..2..3.......... JSWX 8 ED=2.9/2.3/2.3 .......8....5............1.........................67..3..................9.....4 JSWX 8 ED=2.9/1.2/1.2 7....2....1.5.......................................................9.3....8....4 JSWX 8 ED=7.9/7.9/2.6 ..1................8....9........7.............4........5....2................3.. JSWX 8 ED=8.1/8.1/2.6 ....9..................3.........7..2.......8..4.........1..................5.... JSWX 8 ED=8.1/7.9/2.9 .........................1..4.....52.........89.....7..3......................... JSWX 8 ED=9.4/9.4/2.6 111111223441112233444222233444525533664555733665585777668888777668899977688999999 761492583913586247582743916346918752257361498894235671635174829478629135129857364

Code: Select all: ....................5.4..8....9........3............6.......2.....7.............. JSWX 8 ED=8.8/7.7/2.6 111111223441112233444222233444525533664555733665585777668888777668899977688999999 678495123983127546125643987347982615516378492294531768731864259462759831859216374

Code: Select all: .............8........5...............1.................6....3.......4........92. JSWX 8 ED=2.9/1.9/1.9 .......8...............9....5.7...6...1..4.........2............................. JSWX 8 ED=7.1/1.7/1.7 ....................31.97...............................64.58.................... JSWX 8 ED=10.0/10.0/2.8 111111223441112233444222233444525533664555733665585777668888777668899977688999999 124573689749682351683159742952748163361924578875396214296415837518237496437861925

Code: Select all: 5............................9......1........3.......4..2.....67................. JSWX 8 ED=2.8/1.2/1.2 ..................23.5.........4.................8.........7.16.................. JSWX 8 ED=7.7/2.8/2.8 ....6.....4.....7...................1.......3...................5.....8.....2.... JSWX 8 ED=7.9/2.3/2.3 ...7.........3.............8.........2.....6.........4.............1.........5... JSWX 8 ED=9.4/9.4/2.6 111111223441112233444222233444525533664555733665585777668888777668899977688999999 594761238648239175231578649879643521125894763367182954982457316753916482416325897

Some solution grids:

Code: Select all: 723541896436892157891756432652439781187623549945168273268375914579214368314987625 678915324184327596325694187497182635536478912219543768743869251962751843851236479 284765913643918572915273648378641295592384761167539824839427156721856439456192387 162594387927386451384157926756928134431762598895473612673215849518649273249831765 824617539149532768537869142962143857758924613316795284295486371683271495471358926 842793651921654378653871924174925863368142795597316482416287539785439216239568147 854921736246735198731896245695243871178654923329167584567489312983512467412378659 762589134824136957139754826456823719917462583385941672641275398573698241298317465 938576142782143659146952783253784916619238574475621398321895467594367821867419235 759312648198645237642738195835194762267859314413286579586973421374521986921467853 672315984124987536985634127437128695596472318813549762749263851368751249251896473 243691875935874162871265934564937281182543697796158423458326719627419358319782546 861935472312476598475892316296317845548261937739524681624189753987653124153748269 968542713483716259712953486356481972279368541145237698637895124591624837824179365 159624873293875461874163295365297184481359627726438519538916742617542938942781356 925468137657132849138947652742653918819725463364871295271594386493286571586319724 239517684194683752687254193453198267762439518815746329346925871528371946971862435 364927815245816793817395246596241387783564921129758634658439172931672458472183569 651429738218735946739648215845213679976851423324987561587164392463592187192376854 958726341281345679346971285175284936639158724427613598513897462794562813862439157 111111223441112233444222233444525533664555733665585777668888777668899977688999999

by **urhegyi** » Thu Mar 11, 2021 1:59 pm

New layout with 8 clues example. Needs forcing nets. So SE 9+?

Code: Select all: #1/WX/B4,JS .....................9.3............15.....74............6.8..................... 111155666211155566221157566222757566222777888334747888334749988334449998333449999

analyze log:

Code: Select all: Eliminated candidates per Method and per Sudoku Method \ Sudoku | SER | 1 |-------|------ Not counted elims | 0 | 77 Naked Singles | 0.1 | 36 Hidden Singles | 0.2 | 123 Naked Pair [2] | 3 | 6 Naked Triple [3] | 3.6 | 16 Hidden Quad [5] | 5.4 | 12 Pointing/Claiming | 2.8 | 156 Locked Singles[3] | 2.9 | 16 Locked Singles[4] | 3 | 26 Locked Singles[5] | 3.1 | 5 XY-chain [4] | 4.6 | 1 XY-chain [5] | 5.1 | 1 Forcing Nets [4] | 9.4 | 4 Forcing Nets [5] | 9.5 | 10 |-------|------ Eliminated Cand's | 489 | 489 Sum(SER * Cand's) | 887.6 | 887.6 Initial Candidates : 489 Maximum SER rating : 9.5 <- Approach Labour rating : 887.6 <- Experimental rating Guesses (BF/BT;FN) : 986 Time needed : 00:00:08.920

solution:

Hidden Text: Show

by **urhegyi** » Fri Mar 12, 2021 3:47 pm

If the last posted example was to hard try thisone:

Code: Select all: #1/WX/B4,JS ..........3.....9...................18.....76...................4.....2.......... 111155222111555222115554422336654442336666644833376644883377799888777999888779999

solution:

Hidden Text: Show

by **urhegyi** » Sat Apr 03, 2021 4:14 pm

Most symmetrical 8 clues JSWX possible!

Code: Select all: #1/WX/B4,JS ..............................219......7.4......638.............................. 111133344221133344221133444222135544225555588665579888666779988667779988667779999

by **Hajime** » Sun Apr 04, 2021 5:25 am

urhegyi wrote:Most symmetrical 8 clues JSWX possible!
Code: Select all
#1/WX/B4,JS ..............................219......7.4......638.............................. 111133344221133344221133444222135544225555588665579888666779988667779988667779999

very nice layout / puzzle :!:

The New Sudoku Players' Forum

hard minimal 8 clues JSWX examples

hard minimal 8 clues JSWX examples

Re: hard minimal 8 clues JSWX examples

Re: hard minimal 8 clues JSWX examples

Re: hard minimal 8 clues JSWX examples

Re: hard minimal 8 clues JSWX examples

Re: hard minimal 8 clues JSWX examples

Re: hard minimal 8 clues JSWX examples

Re: hard minimal 8 clues JSWX examples

Re: hard minimal 8 clues JSWX examples

Re: hard minimal 8 clues JSWX examples