A lot of what is covered in Phil Gordan's Little Green Book is covered in HOH. However, although a lot of the strategies in HOH apply to ring games, many hands should simply be played differently in ring games than in tournaments. In ring games people can reload at any time, therefore, worry about stack sizes and such is not as useful. Gordan also plays in a more aggressive style than Harrington. He will often bet full houses on the flop. This may seem silly but his arguments for betting are very good. He also has a strategy for getting away from KK preflop. This also may seem silly, but his arguments again are very good. Gordan touches on some different situations for each hand that HOH does not. I would definitely recommend Little Green Book to anyone.