tag:blogger.com,1999:blog-24233158794125739912026-04-23T14:22:26.249-04:00Examples of jammed and locked Sudoku puzzles using SP Notation to illustrate the step-by-step solution. Examples were taken from Toronto Star. Puzzle sets were generated by playing around with Java.SP Notationhttp://www.blogger.com/profile/13354808345065647833noreply@blogger.comBlogger17125tag:blogger.com,1999:blog-2423315879412573991.post-42556767643059695502014-10-10T17:42:00.000-04:002014-10-10T18:22:19.469-04:00

Friday's Sudoku puzzle from Toronto Star gets locked twice. Here is the original puzzle on 10 October 2014 by Pappocom: After only 7 steps it gets locked like this: The key to this first lock lies in the first row. The last 2 cells (columns H and I) have only 3 and 8 as candidates. Thus, 3 and 8 can be eliminated from the rest of row 1, particularly in cell A1. This leaves A1 with a lone

SP Notationhttp://www.blogger.com/profile/13354808345065647833noreply@blogger.com0tag:blogger.com,1999:blog-2423315879412573991.post-78504982597879331682011-08-03T23:59:00.003-04:002011-08-03T23:59:00.363-04:00

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SP Notationhttp://www.blogger.com/profile/13354808345065647833noreply@blogger.com0Toronto, ON, Canada43.653524 -79.383906943.4549435 -79.7022759 43.852104499999996 -79.0655379tag:blogger.com,1999:blog-2423315879412573991.post-58640603520527770872011-07-31T00:14:00.000-04:002011-07-31T00:14:14.690-04:00

Saturday’s Sudoku puzzle from Toronto Star (July 30, 2011) is jammed many times and&nbsp; also locked. &nbsp;The key to unlocking it is by using the full house elimination technique. Here is the puzzle and its annotated step-by-step solution. For more information on SP Notation: First article – Sudoku Puzzle Notation and Elimination techniques Toronto Star, July 24, 2011Page IN2Level:

SP Notationhttp://www.blogger.com/profile/13354808345065647833noreply@blogger.com0tag:blogger.com,1999:blog-2423315879412573991.post-594399211804794562011-07-26T11:16:00.000-04:002011-07-26T11:16:40.565-04:00

Find the single move in each of the 4 jammed Sudoku puzzles.&nbsp; A jammed puzzle has only a possible move (without using elimination techniques). See how fast you can find the single step in each puzzle. For more information: First article – Sudoku Puzzle Notation For the solutions: Spoiler Page Avocado A B C D E F G H I 1

SP Notationhttp://www.blogger.com/profile/13354808345065647833noreply@blogger.com0Toronto, ON, Canada43.653524 -79.383906943.4549435 -79.7022759 43.852104499999996 -79.0655379tag:blogger.com,1999:blog-2423315879412573991.post-92147322353444133812011-07-24T17:41:00.000-04:002011-07-24T17:41:27.366-04:00

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SP Notationhttp://www.blogger.com/profile/13354808345065647833noreply@blogger.com0tag:blogger.com,1999:blog-2423315879412573991.post-46058780513417676482011-07-19T13:59:00.017-04:002011-07-19T14:20:00.422-04:00

Find the single move in each of the 4 jammed Sudoku puzzles.&nbsp; A jammed puzzle has only a possible move (without using elimination techniques). See how fast you can solve these single step Sudoku puzzles. For more information: First article – Sudoku Puzzle Notation For the solutions: Spoiler Page Gooseberry A B C D E F G H I 1

SP Notationhttp://www.blogger.com/profile/13354808345065647833noreply@blogger.com0tag:blogger.com,1999:blog-2423315879412573991.post-14447829988098955882011-06-20T11:35:00.002-04:002011-07-22T23:20:07.912-04:00

Sunday’s Sudoku puzzle from Toronto Star (June 19, 2011) is another example of a locked puzzle. Its key is elimination by confinement. Here is the puzzle and its annotated step-by-step solution. For more information on SP Notation: First article – Sudoku Puzzle Notation and Elimination techniques Toronto Star, June 19, 2011Page IN2Level: Hard 000009016 501000003 000058090 907000020

SP Notationhttp://www.blogger.com/profile/13354808345065647833noreply@blogger.com0tag:blogger.com,1999:blog-2423315879412573991.post-414064625752483182011-05-30T14:26:00.003-04:002011-07-22T23:26:30.146-04:00

Sunday’s Sudoku puzzle from Toronto Star (May 29, 2011) is a good example of a locked puzzle. Its key is elimination by confinement. Here is the puzzle and its annotated step-by-step solution. For more information on SP Notation: First article – Sudoku Puzzle Notation and Elimination techniques Toronto Star,&nbsp; May 29, 2011Page IN2Level: Hard

SP Notationhttp://www.blogger.com/profile/13354808345065647833noreply@blogger.com0tag:blogger.com,1999:blog-2423315879412573991.post-44310491009860282462011-05-24T13:27:00.000-04:002011-05-24T13:27:27.250-04:00

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SP Notationhttp://www.blogger.com/profile/13354808345065647833noreply@blogger.com0tag:blogger.com,1999:blog-2423315879412573991.post-39451364087007390652011-05-24T13:15:00.006-04:002011-08-03T14:29:43.505-04:00

Spoiler Page – it spoils the fun if you have not tried solving the puzzles yet. You can still go to the puzzles with the links below. Try them out before looking at the solutions.First article – Sudoku Puzzle NotationJammed Puzzles – May 17, 2011Jammed Puzzles – May 24, 2011 Jammed Puzzle Set 3 - July 19, 2011&nbsp; For more information on the notation, please read the first article: Sudoku

SP Notationhttp://www.blogger.com/profile/13354808345065647833noreply@blogger.com0tag:blogger.com,1999:blog-2423315879412573991.post-7692145824481235472011-05-17T21:40:00.000-04:002011-05-17T22:12:01.549-04:00

A jammed Sudoku puzzle has one possible move (without using elimination techniques). See how fast you can do these 7. For more information: First article - SP Notation Cantaloupe A B C D E F G H I 1 9 5 2 3 6 3

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