Tournament Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 55: Two Tournament (DiffLev 24-27) Voluntaryism Puzzles (numbers 189-190) 
 
-  Step-by-step instructions for solving  Puzzle 189, (97/144)   Diff: 24/4214.3343.2356.22B2.2425.9963
 -  Step-by-step instructions for solving  Puzzle 190, (96/144)   Diff: 27/745.3557.12B2.21B2.3333.3347.5462