It's certainly older than a few years. I understood it over a decade ago, and I certainly didn't invent it. To be technical though, the article doesn't claim t

It's certainly older than a few years. I understood it over a decade ago, and I certainly didn't invent it. To be technical though, the article doesn't claim that Phil Galfond invented it either. Just that he "published a refinement". He probably posted something on 2+2 that was the earliest example the WSJ's writer found, though he must not have looked very hard if so. Also computer analysis became a factor before the boom (Chris Ferguson won the WSOP main event largely due to it) but the article is pretty accurate about its impact. It's not too much of an exaggeration to say that nobody was good at poker before the year 2000, or maybe even a bit later. The people who won a lot of tournaments back then would fail miserably if they played the same way today. Some of them do in fact.