Friday, January 30, 2009

Improving the NFL distortion

of the overtime coin toss, by the one-and-only Tim Harford:
If the Super Bowl goes into overtime for the first time ever, it's fairly certain who will be victorious: the team that wins the coin toss. In the first round of the playoffs, the Chargers beat the Colts 23-17 in OT, marching down the field for a touchdown after winning the toss. In the 14 overtime games that produced a winner this season, the coin-toss victor won 10 of the games, more than 70 percent. Since 2002, the team that's gotten the toss has won more than 60 percent of overtime games.

With a little ingenuity, there is a way for overtime to be both fair and fast. One solution is usually associated with cake-cutting: one person divides, the other chooses which half to take. In a football overtime, the divide-and-choose rule would dispense with the kickoff and just give the ball to one side. The coin-toss loser would decide how far forward the offense would start—say, the 30-yard line. The coin-toss winner would then decide whether to take possession or let the coin-toss loser have the ball at the 30. The nice thing about these rules is that they would naturally adapt to the game's changing dynamics. The current system, by contrast, seems to have been fair when introduced in 1974, but as field-goal kickers became more accurate, possession has become more valuable.

"Divide and choose" isn't perfect. The coach who divides is at a small disadvantage, because what he does gives a hint about his thinking and his concerns—all sorts of imponderables from his kicker's form in training to the morale of his defensive lineup. The other coach, however, can keep his cards to his chest until the last moment.

An even more elegant solution to the overtime problem was proposed in 2002 by Chris Quanbeck, an electrical engineer (and Green Bay Packers fan). Quanbeck's idea was to auction off possession of the ball in the natural currency of the game: field position. The team that was willing to begin closest to its own goal line would receive the privilege of possession.

Photo link here.

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