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# Articles

Chaining Strategies are fundamental to solving tougher strategies and here I introduce chains and how to build them

• Escargot

The original 'world's toughest Sudoku' and a short explanation of why this solver still can't solve the puzzle

• The Arto Inkala Sudoku

Possibly the latest 'untimate puzzle', created by Arto Inkala. This sparked some ideas about measuring the extremely difficult puzzles.

• The Relative Incidence of Sudoku Strategies

Some raw data on how often each strategies is used

• The 17 Clue 'Proof' - my take on the January 2012 computerised exhaustive search proof that there can be no 16-clue Sudoku puzzle.

• Generalizing Sudoku Strategies

I introduce a paper by Kevin Gromley, talking about a set thoery approach to Sudoku Strategies. March 2014

• Crooks Algorithm

My response to Crooks Algoritm pointing out that is doesn't explain anything at all.