LIGHTING THE WAY
What should West lead against 5
X on the auction above?
A double by a pre-emptive bidder commonly shows a void and asks partner not to lead the suit bid by the defence.
West duly led a club and chose the 
3 as suitpreference for diamonds.
East ruffed and returned a diamond. Message received and understood.
The next club ruff sank the contract for +200. A nice defence.