Idle Analytics» Sudoku

Sudoku: advanced techniques

Reuben — Mon, 04 Mar 2013 06:49:38 +0000

Sudoku puzzles are classified according to their difficulty. My old newspaper, the LA Times, did so as Gentle, Moderate, Tough, and Diabolical. Sites like Daily Sudoku have basically the same division, though the names are different (hard and very hard instead of tough and diabolical). Difficulty is determined by the techniques needed to solve the …

Sudoku: medium difficulty methods

Reuben — Sun, 03 Mar 2013 06:32:13 +0000

A simple elimination algorithm that searches box-by-box, row or column will solve most Gentle and maybe even some Moderate puzzles. The final simple technique knocks out pretty much any remaining Gentle: Technique 4: Enumeration If the previous searches fail, try checking each square on an individual basis to see what numbers it can "see". For …

Sudoku: more basics

Reuben — Sat, 23 Feb 2013 08:07:39 +0000

It's possible to solve a Gentle Sudoku with only a box-by-box search technique. While this is the first technique I will normally apply, it is not the only one necessary to solve most Gentle puzzles. Sudoku has 3 rules: every 3x3 highlighted box must have 1-9, every row must have 1-9, and every column must …

Sudoku: the basics

Reuben — Mon, 18 Feb 2013 06:28:11 +0000

Those of us who think we'll live a long time (not me) have a couple near certain conditions to look forward to. For men, it's prostate cancer. But for either gender, it's dementia. Puzzles ward off dementia. I'm not all that good at puzzles. Over the years I've done crosswords, but they require a bit …