Some would make a natural bid of two clubs, planning to support hearts on the next round.

But she decided to explore slam prospects with a control-showing bid of four clubs.

But East rescued his opponents with a bid of three clubs.

His bid of four clubs left the final decision to his partner, and the bidding ended.

A bid of two clubs is higher than one heart, etc.

The abnormal bid of two clubs allowed him to relax while his partner played three no-trump.

She therefore chose a surprising bid of four clubs, with a double motive.

South's bid of three clubs, the fourth suit, did not necessarily show clubs.

He temporized with a bid of three clubs and heard his partner raise.

Whether North's bid of four clubs was technically forcing is a debatable point.