The New Sudoku Players' Forum

by **daj95376** » Thu Sep 21, 2006 11:11 pm

Deleted: Wrong hierarchy used.

by **tarek** » Thu Sep 21, 2006 11:23 pm

daj95376 wrote:Here's my hierarchy:

Code: Select all
Superior #1: Naked/Hidden Singles, Naked Pairs/Triples, Locked Candidates (1&2), and X-Wing Plus #1: Naked Quads Superior #2: Hidden Pairs/Triples Plus #2: Hidden Quads, Swordfish, and Jellyfish

Manual solvers solving without pencilmarks would spot hidden subsets easier.........

a required technique's removal -as discussed earlier- would render the puzzle unsolvable using the rest of the techniques.

tarek

by **daj95376** » Fri Sep 22, 2006 12:01 am

Thanks gsf and tarek for setting me straight on the need to place Hidden Pairs/Triples before Naked Quads in my hierarchy!!! I've retracted my puzzles.

by ab » Thu Sep 28, 2006 12:28 pm

here's an interesting puzzle:

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

you can solve it with locked candidates and a naked quad, or you can solve it with locked candidates, a naked triple and a swordfish.

by **gsf** » Thu Sep 28, 2006 3:04 pm

ab wrote:you can solve it with locked candidates and a naked quad, or you can solve it with locked candidates, a naked triple and a swordfish.

along with some singles?

by **daj95376** » Sun Oct 01, 2006 9:03 am

Code: Select all: (1) Solution (5) Puzzles (2) Different Swordfish (2) Different Jellyfish (1) Naked Quad 375124689219658734486937215658342971942571368731896542897213456563489127124765893 ...12..8......87....6.3.2.5.5...2.7...2.7.3...3.8...4.8.7.1.4....34......2..65... ..5.2.68....6........9.72...58....7..42.7.36..3....54...72.3........9....24.6.8.. .75.24...2.......4.86....1...8..2....4.571.6....8..5...9....45.5.......7...76.89. 3......89.1.6.......6..72..6..34..7.9.2.7.3.8.3..96..2..72..4.......9.2.12......3 3.5.2.....19.58..4...9.......8...9..94.5.1.68..1...5.......3...5..48.12.....6.8.3

Code: Select all: # Swordfish + Swordfish ...4..8..1.6.....49...6.213...1.3.2.32..4..67.7.6.2...793.1...28.....1.9..4..6... ..6..2...3.271..4.8.....2.77.92...1.....4.....1...73.99.7.....3.4..987.6...4..1.. .5..4.1.6.4.5.....8.17.9...3.49...1...........1...64.8...3.86.4.....1.9.4.8.9..3. 5.3.1.....625.9...9...2.7....1.....5.9.352.1.6.....2....7.6...2...1.546.....4.9.1 # Swordfish + Jellyfish 8.3.....91..2......7..1.5...284...7....598....4...289...5.2..8......9..24.....7.6 # Jellyfish + Jellyfish ..8.125..3.146..2.5..8....18..5......32...65......6..84....3..5.8..512.4..598.1..

by ab » Sun Oct 01, 2006 9:42 am

very nice set of puzzles daj95376, thanks

Here's one of my own, with a jellyfish:

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

by **Eioru** » Sun Oct 01, 2006 5:06 pm

daj95376 wrote:
Code: Select all
# Jellyfish + Jellyfish ..8.125..3.146..2.5..8....18..5......32...65......6..84....3..5.8..512.4..598.1..

What a amazing puzzle with 2 rare jellyfishes with 13 7s and 11 9s ...
I save it to me list, thanks.

by **daj95376** » Fri Oct 06, 2006 12:40 pm

How about two Swordfish ... in the same columns ... and both required!

Code: Select all: ..7.2...36.19..8...8...1..2..4..6...8...1...6...2..9..3..6...8...8..21.97...9.3.. Singles c147 - 4 Swordfish c147 - 5 Swordfish Singles

by **wapati** » Fri Oct 06, 2006 1:53 pm

Eioru wrote:
daj95376 wrote:
Code: Select all
# Jellyfish + Jellyfish ..8.125..3.146..2.5..8....18..5......32...65......6..84....3..5.8..512.4..598.1..

What a amazing puzzle with 2 rare jellyfishes with 13 7s and 11 9s ...
I save it to me list, thanks.

It is quite unusual.

It can be solved with a skyscraper (grouped-x/finned-x) as the first ( ! ) step after setting singles. R1C1->R8C1 against R1C9->R9C9 on sixes, setting R9C2 = 7

Code: Select all: .------------------.------------------.------------------. | 679* 4679 8 | 37 1 2 | 5 34679 3679*| | 3 79 1 | 4 6 5 | 8 2 79 | | 5 2 4679 | 8 379 79 | 3479 34679 1 | :------------------+------------------+------------------: | 8 4679 4679 | 5 379 79 | 3479 1 2 | | 179 3 2 | 17 4 8 | 6 5 79 | | 179 5 479 | 1237 2379 6 | 3479 3479 8 | :------------------+------------------+------------------: | 4 1 679 | 267 27 3 | 79 8 5 | | 679* 8 3 | 67 5 1 | 2 -679 4 | | 2 -67 5 | 9 8 4 | 1 367 367* | '------------------'------------------'------------------'

by **tarek** » Wed Oct 18, 2006 12:11 am

Consider the following 2 puzzles:

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

Both have the same solution & both are Superior+, the 1st is symmetrically minimal & the 2nd minimal but non symmetric. You can destroy/bypass some techniques in the 1st using slightly more difficult techniques, while in the 2nd, you just couldn't. You must therefore use at least the following to solve the second puzzle:

Code: Select all: 1. 1 Swordfish 2. 2 naked doubles with hidden quads counterparts 3. 1 hidden double with a naked triple counterpart 4. 1 hidden double with a naked quad counterpart

if you choose to go by the book.....Then you will enjoy fishing many Swordfishes (Especially the 2nd puzzle) & X-wings(Especially the 1st)....

tarek

by **Pat** » Mon Jan 15, 2007 3:08 pm

Ruud wrote:
Ocean (2006.May.19) wrote:
411 M20s

Non-isomorphic

Identical pattern

20 clues

Minimal
#254
Code: Select all
. . . | . 1 . | . . 2 . . 3 | . . . | . 4 . . 5 . | . . 6 | 1 . . -------+-------+------ . . . | . . 7 | 8 . . 9 . . | . . . | . . 6 . . 4 | 1 . . | . . . -------+-------+------ . . 1 | 3 . . | . 5 . . 6 . | . . . | 9 . . 2 . . | . 4 . | . . .

by **Pat** » Wed Jul 11, 2007 12:02 pm

claudiarabia (2007.Jul.6) wrote:
[ 23 clues ]

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

by **tarek** » Thu Oct 11, 2007 9:30 am

Not symmetric I'm afraid........still very nice

WHAT IS YOUR SHORTEST PATH OUT OF THIS:

Code: Select all: 000000006000005070000090800006000003050007060900080100002800000070003050800010900 . . . | . . . | . . 6 . . . | . . 5 | . 7 . . . . | . 9 . | 8 . . -------+-------+------ . . 6 | . . . | . . 3 . 5 . | . . 7 | . 6 . 9 . . | . 8 . | 1 . . -------+-------+------ . . 2 | 8 . . | . . . . 7 . | . . 3 | . 5 . 8 . . | . 1 . | 9 . .

And another one, symmetric this time

:

Code: Select all: 300004900040010000002600008900000400060000020003000007400001300000090010005800006 3 . . | . . 4 | 9 . . . 4 . | . 1 . | . . . . . 2 | 6 . . | . . 8 -------+-------+------ 9 . . | . . . | 4 . . . 6 . | . . . | . 2 . . . 3 | . . . | . . 7 -------+-------+------ 4 . . | . . 1 | 3 . . . . . | . 9 . | . 1 . . . 5 | 8 . . | . . 6

& before Igo, another one:

Code: Select all: 003000600000274000010000050400005008200190000500003002060000080000758000007000300 . . 3 | . . . | 6 . . . . . | 2 7 4 | . . . . 1 . | . . . | . 5 . -------+-------+------ 4 . . | . . 5 | . . 8 2 . . | 1 9 . | . . . 5 . . | . . 3 | . . 2 -------+-------+------ . 6 . | . . . | . 8 . . . . | 7 5 8 | . . . . . 7 | . . . | 3 . .

tarek

by RW » Thu Oct 11, 2007 10:46 am

tarek wrote:WHAT IS YOUR SHORTEST PATH OUT OF THIS:
Code: Select all
000000006000005070000090800006000003050007060900080100002800000070003050800010900 . . . | . . . | . . 6 . . . | . . 5 | . 7 . . . . | . 9 . | 8 . . -------+-------+------ . . 6 | . . . | . . 3 . 5 . | . . 7 | . 6 . 9 . . | . 8 . | 1 . . -------+-------+------ . . 2 | 8 . . | . . . . 7 . | . . 3 | . 5 . 8 . . | . 1 . | 9 . .

Well, you asked for the shortest path... after singles:

Code: Select all: *-----------------------------------------------------------------------------* | 123457 1234 13457 | 2347 2347 8 | 2345 9 6 | | 2346 8 9 | 2346 2346 5 | 234 7 1 | | 234567 2346 3457 | 23467 9 1 | 8 234 245 | |-------------------------+-------------------------+-------------------------| | 1247 124 6 | 1245 245 9 | 2457 8 3 | | 1234 5 8 | 1234 234 7 | 24 6 9 | | 9 234 347 | 23456 8 246 | 1 24 2457 | |-------------------------+-------------------------+-------------------------| | 3456 9 2 | 8 4567 46 | 3467 1 47 | | 146 7 14 | 9 246 3 | 246 5 8 | | 8 346 345 | 24567 1 246 | 9 234 247 | *-----------------------------------------------------------------------------* [r7c9]-7-[r7c5]=7=[r1c5]-7-[r1c1] =7=[r9c4]=5=[r9c3]-5-[r7c1] -7-[r6c9]=7=[r4c7]-7-[r4c1]=7=[r3c1]=5=[r1c1]-5-[r1c7]=5=[r3c9]-5-[r6c9]=5=[r4c7] r4c7 cannot be both 5 and 7 => r7c9<>7

Rest is singles.

Ok, I admit, horrible solution... Very nice puzzle, definitely not easy to get around the swords and the jelly!

RW

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