Tournament Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 18: Two Tournament (DiffLev 22) Backpointers Puzzles (numbers 115-116) 
 
-  Step-by-step instructions for solving  Puzzle 115, (94/144)   Diff: 22/96.1212.B255.6346.3357.7752
 -  Step-by-step instructions for solving  Puzzle 116, (97/144)   Diff: 22/84.1A1B.4421.B448.8953.7962