Peak under the hood of Tiger’s putting stroke, and you’ll find he aims far to the right: About 2.5 degrees to the right of his intended line, to be exact.
But then by the time the putter face reaches impact, the putter face is closed: It points about a degree to the left of his intended line, which is more than three degrees to the left of where he was aiming.
Tiger is, in simple terms, aiming his putter to the right and then using a hard right-hand release to hook it back. Notice how the blade below says it’s closing about 5.5 degrees? That’s the “hook bias” Charlie talked about over the weekend.
This is also, incidentally, why you’ll often see Tiger start every one of his practice sessions hitting putts with only his right hand. Because he’s instinctively practicing releasing the putter with his right hand. If he didn’t hit release his right hand so aggressively, he’d probably miss putts to the right, like Charlie says he does.
That’s why Charlie says he needs to account bias when Tiger reads putts: Because he doesn’t hook putts as much as Tiger.