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Uragaeshi is a Japanese name for 8×8 reversi game that originated in England.

【How to play】
1. This game competes for the number of discs. Players can flip opponent's discs by sandwiching.
2. The maximum handicap is 60; RankDifference×10.
3. Players can rank up by 10 points.
4. If the user data is not saved, it is necessary to set the DOM storage effective.

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