(_a_) When the declarer revokes, his adversaries add 150 points to
their score above the line,[64] in addition to any liability which the
revoking player may have incurred for failure to fulfil his contract.
(_b_) When either of the adversaries revoke[s], the declarer may add
150 points to his score above the line,[64] or may take three tricks
from his opponents and add them to his own. Such tricks, taken as
penalty, may assist the declarer to fulfil his contract, but they shall
not entitle him to score any bonus above the line, in the case of the
declaration having been doubled or re-doubled.
Under no circumstances can a side score anything, either above or below the
line, except for Honours or Chicane, on a hand in which one of them has
revoked.