Recently I started to read Harrington on Holdem 1. Although I prefer to play sngs (usually 18 man) I guess I've read a lot more cash game strategy, so I'm surprised by how often the book recommends calling. I know there are major differences between cash and tournament play, but I always thought calling would not often be the optimal play in either. Am I misinterpreting the book? I know a hud is of limited use in sng play but how much of a difference between vp and pfr is justified in an 18+ man tournament? I understand the importance of pot odds and position but are there any more tips for calling/limping in tournament play? Thanks in advance.

I'm not saying it's right or wrong, but I will say that the information in that book is a great starting point for players to understand the driving concepts behind tournament play. It will probably give you an even better understanding of tournament play once you read the second volume, and the third volume consists mostly of hand quizzes and explanations through various scenarios.

The basic concepts you are reading are really for first-timers learning the game. I would still recommend reading it, but once you understand it, you can turn the aggression up a bit to suit your preferred style of play.

HoH is old school compared to 2+2. His approach is a lot less aggressive, more trappy, more cautious. He doesn't 3-bet light and advocates calling in the blinds a lot more than 2+2ers typically recommend. He limps some % of the time, doesn't raise smaller than 3X, and doesn't really focus on fold equity a whole lot.

Anyways it's certainly great for learning the fundamentals of tournament poker, and he is really good about consistently emphasizing the importance position and stack sizes. His short & medium stack preflop play is not nearly aggressive enough, though. You're not missing anything; it's just that preflop tournament poker has advanced a ton in the last few years.