Tournament Sudoku Twelve Logic Puzzles (Vol 1) 
 Chapter 51: Two Tournament (DiffLev 23-27) Unimprovable Puzzles (numbers 181-182) 
 
-  Step-by-step instructions for solving  Puzzle 181, (100/144)   Diff: 23/655.6332.22A1.3221.1389.9978
 -  Step-by-step instructions for solving  Puzzle 182, (99/144)   Diff: 27/932.1143.3312.2113.6332.3369.7953