Variations on Intermediate Sudoku Logic Puzzles (Vol 1) 
 Chapter 15: Four Medium Sudoku-7B-2V Puzzles (numbers 73-76) 
 
-  Step-by-step instructions for solving  Puzzle 73, (34/49)   Diff: 5/7.8972
 -  Step-by-step instructions for solving  Puzzle 74, (35/49)   Diff: 7/458.4482
 -  Step-by-step instructions for solving  Puzzle 75, (39/49)   Diff: 8/6444.4863
 -  Step-by-step instructions for solving  Puzzle 76, (39/49)   Diff: 8/4634.4666