Medium Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 39: Two Medium (DiffLev 6-8) Overmatching Puzzles (numbers 157-158) 
 
-  Step-by-step instructions for solving  Puzzle 157, (66/144)   Diff: 6/99.9542
 -  Step-by-step instructions for solving  Puzzle 158, (79/144)   Diff: 8/9999.3582