If, for example, you were digging when you suddenly ran into someone else's mine, then you had no choice but to admit defeat, and stop digging.
如果向前掘進時，發現前路已被別人的坑道「剪斷」，必須認輸，不得再挖；如果和別人的坑道迎面碰個正著，就算打平，雙方攜手合作，一起找礦脈。