Guide to solving a moderately difficulty Sudoku puzzle step by step

Using a range of different solution strategies a moderate Sudoku is solved step-by-step.

Other guides available

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Index of available guides
Running a Tutorial
Choosing a Tutorial
Only Choice rule for gentle puzzles
Only Square rule for gentle puzzles
Single Possibility rule for gentle puzzles
Two out of Three strategy for gentle puzzles
Shared Subgroup rule for gentle and moderate puzzles
Naked Twin rule for moderate puzzles
Hidden Twin rule for tough puzzles
X Wing rule for tough puzzles
Swordfish rule for tough puzzles
Alternate Pair rule for very tough puzzles
Hook rule for very tough puzzles
Trial and error rule for any puzzle
Solving a gentle puzzle step by step
Gentle puzzle solved using Only Choice and Only Square
Moderate puzzle solved using some Twin and Sub-group logic
Challenging puzzle solved using Hook and Sub-group logic