MICROSOFT WANTS TO help you sword fight without the physical risks of getting stabbed. The company's solution? A team at Microsoft Research has created a hardware localization technology that enables you to play a multi-player sword fighting game using only smartphones. No, you won't need to attach any crazy lasers or peripheral accessories to make it work. The team's aptly named SwordFight game requires only the existing hardware in most shipping smartphones. But it's also not quite as simple as an app like Star Wars: Lightsaber Duel.

"There’s a lot of technology now that allows phones to connect. But if you want to enable games that have a more active flavor, then you need more," Thomas Moscibroda, a Lead Researcher in the Mobile & Sensing Systems Research Group at Microsoft Research Asia, told Wired. "What you need is a technology that allows mobile devices to localize each other. If I move, I need to know how close your phone is next to me."

Moscibroda and his colleagues on the Microsoft Research team have developed a technology called FAR. It's a new sound-ranging scheme that makes it possible for a smartphone to locate another smartphone by measuring sound. One phone sends out a chirp, and a second phone determines the distance and the position of the first phone by measuring the time it takes for the chirp to travel to its speaker. In SwordFight, two players aim their phones toward each other, and try to jab at the other person's handset. When one player's phone strikes within 15 centimeters of the other player's phone, the second player loses a point. It's as if there are imaginary swords, albeit very tiny ones, jutting out from each device. With the help of a phone's accelerometer and digital compass, the game can tell which opponent did the striking. But what's unique is the fact that the phones can know how close they are to one another. (See the video example below.)

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