Sudoku Primer 139 - TidBits - Unique Rectangles or Ambiguity Rule
Sudoku Primer 140 - the Gate Pattern
Diabolical Sudoku Guide: Part 2 of 3: Y Wings and Empty Rectangles
Sudoku Primer 104 - solving tips for hard puzzle - diagonal pattern
Sudoku Primer 281 - How to Solve “The Mole 1” Without Pencil Marks – Sudoku Primer Collaboration
Sudoku Primer 168 - Sudoku Double Row-Column Elimination Technique
Sudoku Primer 91 - pop-quiz solving diabolical puzzle - Sudoku To Go vol 105 (sudoku expert tips)
Sudoku Primer 138 - subscriber request - patterns and techniques
Sudoku Primer 137 - subscriber request (double row/col elimination)
Sudoku Primer 141 - the L pattern
Controversial But Useful Sudoku Strategies Unique Rectangles Explained
Sudoku Primer 229 - Keep Your Eyes on the Entire Sudoku Puzzle
Sudoku Primer 180 - A Will Shortz 'Very Challenging' Puzzle - Subscriber Request
Sudoku Primer 328 - Unique Rectangles Help Solve a Diabolical Puzzle
Unique Rectangles for Newspaper Sudoku Puzzles
Sudoku Primer 261 - Using Hidden Patterns
Sudoku Primer 263 - A Unique Way to Look At Unique Rectangles
Sudoku Primer 80 - ambiguity rule in a hard puzzle - Sudoku To Go vol 104 (sudoku tips and tricks)
You'll NEVER Believe How To Solve This Sudoku! SHC 163
SudokuPrimer 9 - tricks for solving columns using twins
