Tournament Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 49: Two Tournament (DiffLev 27-28) Turbomachine Puzzles (numbers 177-178) 
 
-  Step-by-step instructions for solving  Puzzle 177, (98/144)   Diff: 27/951.1111.AA11.1225.2A12.4324.9994
 -  Step-by-step instructions for solving  Puzzle 178, (88/144)   Diff: 28/8221.1D32.2332.CA11.1322.3467.6861