The other might then also stop digging at the original place and switch to where you are now working. Then you could switch back to the original target, and by the time your opponent discovered that he had been had, the game would already be won.
等他發現情況不對再回頭時，大勢去矣！曾用過這招的廖四川記得，當年他的對手上了當，才差二天就被他挖去黃金五萬兩。