Difficult Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 9: Six Difficult (DiffLev 9-11) tpsmith Puzzles (numbers 73-78) 
 
-  Step-by-step instructions for solving  Puzzle 73, (82/144)   Diff: 9/9.9999.9631
 -  Step-by-step instructions for solving  Puzzle 74, (88/144)   Diff: 9/9.8979.9997
 -  Step-by-step instructions for solving  Puzzle 75, (83/144)   Diff: 10/99.5439.9995
 -  Step-by-step instructions for solving  Puzzle 76, (86/144)   Diff: 10/94.4346.7999
 -  Step-by-step instructions for solving  Puzzle 77, (96/144)   Diff: 10/98.9799.9865
 -  Step-by-step instructions for solving  Puzzle 78, (93/144)   Diff: 11/999.8989.7575