6 






5 






4 






3 






2 






1 






A 
B 
C 
D 
E 
F 
Clues: A12 = 6 A56 = 7 AB4 = 6 BC1 = 6 B23 = 9
BCD5 = 8 D12 = 7 DEF6 = 7 E123 = 11 F45 = 8
In a 6x6 Latin Square, you are to fill a square grid with numbers from 1 to 6 so that each row and column contains one of each number (i.e., no repetitions in a row or in a column.) The clues give you the sum of some two or three in a row. Use labels AF across the bottom, 16 up the side. For example, if ABC3 = 9 were a clue, that would mean that A3 + B3 + C3 adds up to 9.
Source: Internet newsgroup rec.puzzles, 1994. Originally titled as "Latino Puzzle #2".