强中自有强中手. [qiáng zhōng zì yǒu qiáng zhōng shǒu]

• However strong you are, there's always someone stronger.; Among the stronger there is always a stronger.; catch a tartar; diamond cut diamond:

  However strong you are, there's always someone stronger.; For every able person there is always one still abler.

  强中自有强中手， 能人背后有能人。