As the game against the Lakers started, Morey took his seat, on the aisle, nine rows behind the Rockets’ bench. The odds, on this night, were not good. Houston was playing without its injured superstar, McGrady (who was in the clubhouse watching TV), and its injured best supporting actor, Ron Artest (cheering in street clothes from the bench). The Lakers were staffed by household names. The only Rockets player on the floor with a conspicuous shoe contract was the center Yao Ming — who opened the game by tipping the ball backward. Shane Battier began his game by grabbing it.

Before the Rockets traded for Battier, the front-office analysts obviously studied his value. They knew all sorts of details about his efficiency and his ability to reduce the efficiency of his opponents. They knew, for example, that stars guarded by Battier suddenly lose their shooting touch. What they didn’t know was why. Morey recognized Battier’s effects, but he didn’t know how he achieved them. Two hundred or so basketball games later, he’s the world’s expert on the subject — which he was studying all over again tonight. He pointed out how, instead of grabbing uncertainly for a rebound, for instance, Battier would tip the ball more certainly to a teammate. Guarding a lesser rebounder, Battier would, when the ball was in the air, leave his own man and block out the other team’s best rebounder. “Watch him,” a Houston front-office analyst told me before the game. “When the shot goes up, he’ll go sit on Gasol’s knee.” (Pau Gasol often plays center for the Lakers.) On defense, it was as if Battier had set out to maximize the misery Bryant experiences shooting a basketball, without having his presence recorded in any box score. He blocked the ball when Bryant was taking it from his waist to his chin, for instance, rather than when it was far higher and Bryant was in the act of shooting. “When you watch him,” Morey says, “you see that his whole thing is to stay in front of guys and try to block the player’s vision when he shoots. We didn’t even notice what he was doing until he got here. I wish we could say we did, but we didn’t.”

People often say that Kobe Bryant has no weaknesses to his game, but that’s not really true. Before the game, Battier was given his special package of information. “He’s the only player we give it to,” Morey says. “We can give him this fire hose of data and let him sift. Most players are like golfers. You don’t want them swinging while they’re thinking.” The data essentially broke down the floor into many discrete zones and calculated the odds of Bryant making shots from different places on the court, under different degrees of defensive pressure, in different relationships to other players — how well he scored off screens, off pick-and-rolls, off catch-and-shoots and so on. Battier learns a lot from studying the data on the superstars he is usually assigned to guard. For instance, the numbers show him that Allen Iverson is one of the most efficient scorers in the N.B.A. when he goes to his right; when he goes to his left he kills his team. The Golden State Warriors forward Stephen Jackson is an even stranger case. “Steve Jackson,” Battier says, “is statistically better going to his right, but he loves to go to his left — and goes to his left almost twice as often.” The San Antonio Spurs’ Manu Ginóbili is a statistical freak: he has no imbalance whatsoever in his game — there is no one way to play him that is better than another. He is equally efficient both off the dribble and off the pass, going left and right and from any spot on the floor.

Bryant isn’t like that. He is better at pretty much everything than everyone else, but there are places on the court, and starting points for his shot, that render him less likely to help his team. When he drives to the basket, he is exactly as likely to go to his left as to his right, but when he goes to his left, he is less effective. When he shoots directly after receiving a pass, he is more efficient than when he shoots after dribbling. He’s deadly if he gets into the lane and also if he gets to the baseline; between the two, less so. “The absolute worst thing to do,” Battier says, “is to foul him.” It isn’t that Bryant is an especially good free-throw shooter but that, as Morey puts it, “the foul is the worst result of a defensive play.” One way the Rockets can see which teams think about the game as they do is by identifying those that “try dramatically not to foul.” The ideal outcome, from the Rockets’ statistical point of view, is for Bryant to dribble left and pull up for an 18-foot jump shot; force that to happen often enough and you have to be satisfied with your night. “If he has 40 points on 40 shots, I can live with that,” Battier says. “My job is not to keep him from scoring points but to make him as inefficient as possible.” The court doesn’t have little squares all over it to tell him what percentage Bryant is likely to shoot from any given spot, but it might as well.

The reason the Rockets insist that Battier guard Bryant is his gift for encouraging him into his zones of lowest efficiency. The effect of doing this is astonishing: Bryant doesn’t merely help his team less when Battier guards him than when someone else does. When Bryant is in the game and Battier is on him, the Lakers’ offense is worse than if the N.B.A.’s best player had taken the night off. “The Lakers’ offense should obviously be better with Kobe in,” Morey says. “But if Shane is on him, it isn’t.” A player whom Morey describes as “a marginal N.B.A. athlete” not only guards one of the greatest — and smartest — offensive threats ever to play the game. He renders him a detriment to his team.

And if you knew none of this, you would never guess any of it from watching the game. Bryant was quicker than Battier, so the latter spent much of his time chasing around after him, Keystone Cops-like. Bryant shot early and often, but he looked pretty good from everywhere. On defense, Battier talked to his teammates a lot more than anyone else on the court, but from the stands it was hard to see any point to this. And yet, he swears, there’s a reason to almost all of it: when he decides where to be on the court and what angles to take, he is constantly reminding himself of the odds on the stack of papers he read through an hour earlier as his feet soaked in the whirlpool. “The numbers either refute my thinking or support my thinking,” he says, “and when there’s any question, I trust the numbers. The numbers don’t lie.” Even when the numbers agree with his intuitions, they have an effect. “It’s a subtle difference,” Morey says, “but it has big implications. If you have an intuition of something but no hard evidence to back it up, you might kind of sort of go about putting that intuition into practice, because there’s still some uncertainty if it’s right or wrong.”