Variations on Intermediate Sudoku Logic Puzzles (Vol 1) 
 Chapter 47: Eight Challenging Sudoku-8-X Puzzles (numbers 269-276) 
 
-  Step-by-step instructions for solving  Puzzle 269, (48/64)   Diff: 14/43.41A1.2123.6578
 -  Step-by-step instructions for solving  Puzzle 270, (49/64)   Diff: 14/47.2211.1236.5375
 -  Step-by-step instructions for solving  Puzzle 271, (47/64)   Diff: 15/524.33A2.2123.1783
 -  Step-by-step instructions for solving  Puzzle 272, (49/64)   Diff: 15/233.1253.3433.3464
 -  Step-by-step instructions for solving  Puzzle 273, (47/64)   Diff: 16/6363.1111.1123.6552
 -  Step-by-step instructions for solving  Puzzle 274, (48/64)   Diff: 16/2332.3211.1A35.6636
 -  Step-by-step instructions for solving  Puzzle 275, (49/64)   Diff: 16/531A.1A11.2326.8851
 -  Step-by-step instructions for solving  Puzzle 276, (50/64)   Diff: 16/1111.1B24.6245.9351