For example, following 1 – 1 ; 2 – ?, responder may have a weak hand such as QJ86 K2 8762 Q74 and be planning to rebid 2, a simple preference, if opener made a typical rebid such as 1NT or 2, and to pass if opener rebid 2 or 2. However, following the reverse, he must now rebid 3. Thus the reverse has forced the partnership to commit to taking nine tricks instead of eight - based on the extra strength of opener.