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。
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.