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Regular Samurai #40
http://www.rcbroughton.co.uk/sudoku/forum/viewtopic.php?f=16&t=388		 Page 1 of 1
Author:  tarek [ Sun Jan 25, 2009 6:28 pm ]
Post subject:  Regular Samurai #40
3 puzzles sharing an isomorphic solution grid:

Regular Samurai #40A (Apprentice): Well, there are a few intersections over the limit :)
Rating based on required solving techniques:  Hard

Image
40A Line Format:
Code:
.8.9.1...4.38..9.5.7.4...8.139.4.......2....98.....3...6...5.....1.......2..8....
.9.561.....7...1....4....6..16.4...3....15..884......1.....342....6.8..9...7.....
.....7........9........5.........794.........645.........4........1........9.....
.....3...1..9.2....987.....9......585..39....8...4.23..5....8....2...1.....627.9.
....2..6.......5.....9...1...3.....68....4.......3.274.9...3.8.7.5..64.3...5.9.2.

Regular Samurai #40B (Master)
Rating based on required solving techniques:  Extra Hard

Image
40B Line Format:
Code:
512.9.......5....83.....9...2.6.7...9.53..7.1.8.9...6..4...6.....7.......3..2....
.6.123.....4...2....8....7..92.5...8....69..787......6.....186....2....4...9.....
...6........4........5.....561.....................753.....7........6........1...
.....1...6....3....259.....4......588..74....9...5.34..3....5....4...1.....437.6.
....8..2.......4.....7...3..8...5.1.7.6..89.5...4.6.8...9.....86....2.......5.694

Regular Samurai #40C (Chief Wizard)
Rating based on required solving techniques:  Hellish Nightmare

Image
40C Line Format:
Code:
.4.1.8.....73..6.2.3.....1.98..2.......4....8......5.......3.....8.......5..9....
.1.9.......9...5....8....2...7.3...6....94...32......7.....281....5....9...8.....
...6........4........5...........419.........795...........7........9........4...
.....8...9....4....746.....5......67...41....1...5.3...1....4....6.........38..9.
....8..7.............3...5...9.....52....3.......4.369.5...2.4.6.1..78.....6.4.3.


Enjoy,

tarek
Author:  Børge [ Tue Jan 27, 2009 8:22 pm ]
Post subject:  Re: Regular Samurai #40
Tarek, thanks for a great Apprentice and an ever greater Master level puzzle! :applause:
I really enjoyed the N/H-Subsets required for solving these puzzles.

Finding the crucial N/H-Subsets combination breaking the Master level puzzle, did not come easy to me.
I first found it after I could not find any further advanced solving techniques ... leading nowhere. I found 2 Finned Fish, 1 X-Wing (and 1 Turbot Fish, if I remember correctly).
Hidden Text:
And when approaching the Finish Line, I spotted and used a Finned X-Wing before seeing the intended Skyscraper for the same digit (the only advanced technique required). :lol:
Author:  tarek [ Fri Jan 30, 2009 6:57 pm ]
Post subject:  Re: Regular Samurai #40
I'm glad you've enjoyed it ....

When subgrid 4 is the only one left (past the subsets/x-wing)....

Code:
Master g4:
+----------------+----------------+----------------+
| 3    4    78   | 5    78   1    | 9    2    6    |
| 6    789  789  | 28   278  3    | 4    1    5    |
| 1    2    5    | 9    6    4    | 8    7    3    |
+----------------+----------------+----------------+
| 4    16   2    | 3    19   69   | 7    5    8    |
| 8    5    3    | 7    4    2    | 6    9    1    |
| 9    167  167  | 16   5    8    | 3    4    2    |
+----------------+----------------+----------------+
| 7    3    69   | 12   12   69   | 5    8    4    |
| 2    69   4    | 68   89   5    | 1    3    7    |
| 5    18   18   | 4    3    7    | 2    6    9    |
+----------------+----------------+----------------+


There are several options, one of them is a remote pair :dance:
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