East might have doubled two clubs to suggest a lead of that suit.

East naturally doubled, but unfortunately he was not on lead.

East doubled again, and West had to make a crucial lead.

So East doubled four hearts, an action he later regretted.

East doubled six diamonds in an attempt to suggest a club lead.

East eventually doubled three clubs, which should have failed by one trick.

East doubled with some confidence, and West led a spade.

East doubled six clubs for no very good reason, and West led the diamond king.

This might have worked out as planned, but East doubled six clubs.

East would no doubt have doubled and led the heart king, crashing his partner's queen.