SudokuSolver Forum
http://www.rcbroughton.co.uk/sudoku/forum/

Regular Samurai #80
http://www.rcbroughton.co.uk/sudoku/forum/viewtopic.php?f=16&t=641		 Page 1 of 1
Author:  tarek [ Tue Nov 03, 2009 4:52 pm ]
Post subject:  Regular Samurai #80
Regular Samurai #80A (Apprentice)
Rating based on required solving techniques:  Hard

Image
80A Line Format:
Code:
.6.8...1..95..4......5..2..8.3.....2...9.7.....4....78.1..4..........6..3..79....
...56..4.15......27..8.......3.4.....6...5..1..5...4.9...3.9.......7..5.......31.
....6....6....1............5.4....2....9....6.1..3.........2......4..........6.1.
.3..28.....4.......1..4....7.3.....1...8..7.5.9..5....5....2.3....4..6.7..2..3...
...6.3......8....7.1....3......2..1.4.7......8...3.9.2...5.1.7...8....391....8...


tarek
Author:  Ed [ Thu Nov 05, 2009 6:38 pm ]
Post subject:  Re: Regular Samurai #80
Thanks Tarek. This one just kept flowing until finally hitting a snag. Managed to quickly see a nice way to get moving again.

Regular Samurai #80A (Apprentice) Walkthrough
Hidden Text:
SudokuSolver All Simpler (SSAS) - (download attachment from #79 thread)

From SSAS
1. Grid 3 [edited typo]: 7 locked in r48c56 -> 8 cannot be locked in both r48c56 since it would force multiple solutions -> no 8 in r8c56

SSAS to the end.

Cheers
Ed
Author:  tarek [ Sun Nov 15, 2009 9:08 am ]
Post subject:  Re: Regular Samurai #80
Nice one ED,

You will probably enjoy my next Samurai #84

tarek
Author:  tarek [ Sat Nov 28, 2009 2:25 pm ]
Post subject:  Re: Regular Samurai #80
This is a suggested walkthrough:
Non single moves:
Code:
.6.8...1..95..4......5..2..8.3.....2...9.7.....4....78.1..4..........6..3..79....
...56..4.15......27..8.......3.4.....6...5..1..5...4.9...3.9.......7..5.......31.
....6....6....1............5.4....2....9....6.1..3.........2......4..........6.1.
.3..28.....4.......1..4....7.3.....1...8..7.5.9..5....5....2.3....4..6.7..2..3...
...6.3......8....7.1....3......2..1.4.7......8...3.9.2...5.1.7...8....391....8...
2 forms an intersection in g2r9/g2b8 [g2r7c5][g2r8c46]<>2
9 forms an intersection in g3b4/g3r6 [g3r6c789]<>9
7 forms an intersection in g3b1/g3r1 [g2r7c2][g3r1c6]<>7
1 forms an intersection in g4b7/g4c3 [g4r56c3]<>1
3 forms an intersection in g1b9/g1r7 [g1r7c46]<>3
7 forms an intersection in g3r8/g3b8 [g3r79c5]<>7
2 forms an intersection in g5r1/g5b3 [g5r2c78]<>2
4 forms an intersection in g1b1/g1c1 [g1r8c1]<>4
7 forms an intersection in g1b9/g1r7 [g1r7c3]<>7
7 forms an intersection in g3b7/g3c2 [g3r5c2]<>7
2 forms an intersection in g4r5/g4b4 [g4r6c1]<>2
38 is a hidden double in g1c8 [g1r7c8]<>9
19 is a hidden double in g4c3 [g4r7c3]<>7
7 forms an intersection in g4b7/g4c2 [g4r2c2]<>7
7 forms an intersection in g4r2/g4b2 [g4r13c4][g4r3c6]<>7
38 is a naked double in g3c2 [g3r9c2]<>8
238 is a hidden triple in g4r3 [g4r3c1]<>6 [g3r9c1]<>9 [g3r9c3]<>9
6 forms an intersection in g4b1/g4r2 [g4r2c56]<>6
9 forms an x-wing in g3r2r9/g3c2c5 [g3r78c5]<>9
Puzzle Solved
 Solution:
267839514195274386438516297873451962621987453954362178512648739789123645346795821
389562147156437892724891563913748625468925731275613489541389276832176954697254318
739268541645791832821543697564187329387924156912635478476312985158479263293856714
935128476264397158817546293753264981126839745498751362541672839389415627672983514
985673421263814597714952386396425718427189653851736942632591874548267139179348265
Page 1 of 1 All times are UTC
Powered by phpBB® Forum Software © phpBB Group
https://www.phpbb.com/