My comments:
This is an idiom that originates from playing cards, the deck being a pack of cards. To stack the deck means to shuffle and arrange the cards before dealing them.
To gain an advantage, sometimes a player cheats by arranging the cards in a certain way so that he will make sure of drawing, for example, more aces for himself.
Hence, the dishonest connotation in this phrase. In the above example, the speaker suggests that someone may have "arranged" things behind his back to hurt his chances of promotion.
Either that or "just fate" – a good excuse.
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About the author:
Zhang Xin(张欣) has been with China Daily since 1988, when he graduated from Beijing Foreign Studies University. Write him at: zhangxin@chinadaily.com.cn, or raise a question for potential use in a future column.