Sudoku

I was on the train to Changsha (Hunan) from Wuhan (Hubei) and chose to travel “hard seat” this time. Across from me was a university student. He watched me do Sudoku—the addictive number game…. Here we were, very close to the big lake (Hu) from which the Province of Hunan (south of the lake) and Hubei (north of the lake) get their names.