It teaches you how to think out-side the box from the opening position. 10 moves after, it transforms into normal chess. I don't know about expert, cause I'm only about 1200-1300, but it can't hurt. In 960, I'm 1550. Check out CastleLong.com, there's a book about it.
Does chess 960 help your real chess game ?
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If so how and does anyone know how it has helped higher quality players (expert or higher) ?