Today's post, Rationality is Systematized Winning was originally published on 03 April 2009. A summary (taken from the LW wiki):

The idea behind the statement "Rationalists should win" is not that rationality will make you invincible. It means that if someone who isn't behaving according to your idea of rationality is outcompeting you, predictably and consistently, you should consider that you're not the one being rational.

Discuss the post here (rather than in the comments to the original post).

This post is part of the Rerunning the Sequences series, where we'll be going through Eliezer Yudkowsky's old posts in order so that people who are interested can (re-)read and discuss them. The previous post was Selecting Rationalist Groups, and you can use the sequence_reruns tag or rss feed to follow the rest of the series.

Sequence reruns are a community-driven effort. You can participate by re-reading the sequence post, discussing it here, posting the next day's sequence reruns post, or summarizing forthcoming articles on the wiki. Go here for more details, or to have meta discussions about the Rerunning the Sequences series.