How can I rear my child NOT to be a sore loser?

My seven year-old is extremely talented, and excels well in her studies. But when it comes down to simple games, (board games, outdoor games) she gets exasperated and angry if she loses. As an example, I played a simple game of hide-and-seek with her yesterday at the park. I hid in a rather good place- and after... show more My seven year-old is extremely talented, and excels well in her studies. But when it comes down to simple games, (board games, outdoor games) she gets exasperated and angry if she loses. As an example, I played a simple game of hide-and-seek with her yesterday at the park. I hid in a rather good place- and after she looked for me for about 2 to 3 minutes she gave up... bawling her little eyes out! I tried explaining to her that it's only a game, and she needs to loose gracefully. If she acts this way in school, no one will want her to participate in any games with them. What advice can you give?
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