Dealer West E/W Vul.

6 4
A Q 10 8 7
Q J 9 3
A K Q 8 3
K 9 6 4 3
A 5
J 9 7 5 2
J 5
8 6 5 3 2
K 10 8 7 4 2
Q J 10 7 4

The Auction:

West North East South
1 Double 4 5

West led his singleton club, which dummy’s king won. South read the lead as a singleton. Should a trump be led, West would win and underlead his  A K Q and East would gain entry with his knave and give his partner a ruff, thus setting the contract.

South therefore played dummy’s A followed by the Q on which, when East could not cover, he threw his singleton spade.

After this the contract cannot be defeated for as West has the A East cannot obtain the lead in order to give the ruff. This entry killing play of throwing a loser on a loser can be very profitable at times. Its aim is, of course, to keep out of the lead one opponent whose lead value rank higher that that of his partner.