The New Sudoku Players' Forum

[gurth]

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This puzzle was first posted in the thread "Gurth's Puzzles" in the forum "General/Puzzles".

Code: Select all

#
# "Ocean's "Extreme Jade puzzle (for gurth)".
# gsfr=99839 ; ER: fails.
#
 *-----------*
 |..1|..2|...|
 |.3.|.4.|.5.|
 |6..|7..|8..|
 |---+---+---|
 |..8|...|..7|
 |.1.|...|.3.|
 |9..|...|5..|
 |---+---+---|
 |..2|..1|..6|
 |.4.|.5.|.2.|
 |...|6..|9..|
 *-----------*


NOTE: "..." denotes steps using Simple Sudoku program.
Sub-nets are enclosed thus: (?xay...??) and sub-sub-nets thus: ((?xay...??)).

Solution:

(1) 6h3, 9g2, 2k5, 5k9, 5g1, -5e4(MC).

(2) ?5d2..., -6a5b7d6(MC)..., (?7b1...??)-7b1..., -8f8g4h9(MC)...?? -5d2...

(3) ?5c2..., (?2d2..., -1d8(colours)..., ((?6a5...??))-6a5...??)-2d2..., -6f6(MC), (?4d1...??)-4d1, 3d1..., -4e6(MC), (?-9b9c3...??)(9b9 OR 9c3), -9b3c8, 7b3...?? -5c2, 2c2...many singles placed..., -6f6(MC).

(4) ?-7b1k3...??(7b1 OR 7k3), -7b3hk1..., -4e4(MC).

(5) ?7a1...?? -7a1, 8a1, 7b1.

(6) ?7g7...?? -7g7.

(7) ?7g5...?? -7g5...End.


Notes:
Only one sub-sub-net used, in step (3).
No nets were tried and then rejected.
I might find shorter paths, but then I am adding to my total work. My aim is to solve the puzzle as quickly as possible, not to find the shortest solution, which would take much more work and searching.
__________________________________

Ocean,
thank you for this wonderful present, your second entry into the rarified world of the super-SE sudokus! A world which now consists of 3, as far as I know.
I couldn't resist this Extreme Jade.
_____________________________

[Ocean]

thank you for this wonderful present, your second entry into the rarified world of the super-SE sudokus! A world which now consists of 3, as far as I know.

Glad you liked it, and thank you for the solution. The number of known super-SE sudokus is now at least ten. In addition to the four you already solved (ArtoI's "Etana", Tarek's "Gyroscope #1", my "Anemone" and "Extreme Jade puzzle for gurth"), we have these six (from the "hardest sudokus" thread - the numbers refer to appearance in the so-called "gold list"):

001002000030040050600700800006000007010000030900000600007001008040030020000500900 #5/gold gsfr=99960 ER=N/A
001002000030040050600700800006000007010000020900000500003001006040050030000800900 #4/gold gsfr=99920 ER=N/A
001002000030040050600700800008000007010000040900000500004001008020030010000600900 #6/gold gsfr=99909 ER=N/A
001002000030040050500600700007000006010000020800000400006001009040030010000700800 #2/gold gsfr=99859 ER=N/A
001002000030040010500600700007000006010000030800000900002007001040050020000900800 #1/gold gsfr=99687 ER=N/A
001002000030040050500600700007000006010000030800000900009003002020010040000700800 #3/gold gsfr=99527 ER=N/A

[gurth]

.
Ocean, thanks for the list of the other 6 super-SEs. I shall certainly solve them (or try) for my own amusement.

As I have just posted 7 solutions to 9.9+ puzzles in short order, it occurs to me that the voracious appetite for my solutions might be flagging.

But these puzzles are there to be solved, and if no-one else is going to solve them, then I am.
_______________________________

[leon1789]

Other solution :

C#z means "zC leads to a contradiction using singles".

Code: Select all

   123 456 789
  *-----------*
a |..1|..2|...|
b |.3.|.4.|.5.|
c |6..|7..|8..|
  |---+---+---|
d |..8|...|..7|
e |.1.|...|.3.|
f |9..|...|5..|
  |---+---+---|
g |..2|..1|..6|
h |.4.|.5.|.2.|
k |...|6..|9..|
  *-----------*

1) if k3 = 3, then c3#4, b1#2, b3#7, b6#8, a7#6, b1#8, and contradiction using singles,
so -3k3

2) after that, b7#6, a2#7, a7#6, and finish with singles

[daj95376]

leon1789: I know that you are trying to switch to Gurth's notation for labeling puzzles. As such, you need to make row 'i' a 'k'.

[leon1789]

leon1789: I know that you are trying to switch to Gurth's notation for labeling puzzles. As such, you need to make row 'i' a 'k'.

Exact ...done thanks