我经常和爸爸在家下棋，爸爸下得比我好，总是赢我，但我下决心，

要赢他，有时我私下研究，想提高棋艺，昨天我终于赢了一次。

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I often played chess with my father at home。 He played better than me and always beat me。 But I made up my mind to beat him。 Sometimes I studied chess in secret in order to improve the skill in chess。 Yesterday I beat him at last。