[Nfinity]

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There are limit bots out there that are crushing high stakes limit. The only bots out now for NL are shortstack bots for microlimits. To me, that says a lot about the game of limit compared to NL.

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As someone who has had a little bit of experience with the programming of a poker bot (not one that will ever used on a poker site, or have the ability to do so) I can add a little insight into this as well.

The fact that there are bots winning (not crushing) at High Stakes Limit games but not so many winning NL bots is because of inherent laziness of programmers and lack of efficient material to build upon.

Bot programmers are just that...programmers. That's what they have spent their time learning to do. A bot programmer doesn't necessarily want to learn the intricacies of poker play, they want to teach a computer to do it for them. Instead of learning for themselves the ins and outs of a certain type of poker, they draw upon available RELIABLE resources, learn the basics and the math involved and let the bot figure out the rest. There is a world of knowledge written about limit poker which has been there for quite some time. It hasn't been until recently that the ins and outs of NL poker have been described, in detail, in an easy to read and readily available at any bookstore format.

Lack of innovation is another reason for this phenomena. Most of "bots" out there are shells that one buys and then scripts his or her own strategy into, or they laughably use the "out of the box" bot that is break even at full ring low-limit tables at best. Even those that do "innovate" see that it is a lot easier to program a line of code each for responses to a "Fold" or "Raise" of one betting increment, than it is to program exact bet increments, and responses to a "Raise of 1 betting increment", "Raise of 2 increments" etc. It's just been easier so far.

It's possible for the most profitable bots to be NL bots, simply because they could in theory keep a history of from the very first hand you played together and call upon relevant HH's based on your current play. They could also, again theoretically, do complicated bet sizing that would force more play mistakes from opponents. The only reason they aren't around is because the resources weren't there.
Keep a lookout for these guys in the coming years unfortunately.