Here’s a game from one of Dombo’s teams matches last week. It’s a nice deal to analyze. If I could only bring up the concentration to do this during a match instead of post mortem.
South had to play 4 doubled. During the auction West interfered with some number of and East finally doubled 4. West starts with the King. Plan the play!
Let’s do this together. Trumps are very likely to be 1-4 both honours offside, a loser, are soft and the have to be tackled as well. Ducking the lead doesn’t do much harm, the continuation is for your Ace. Draw one round of trumps by running the Ten. East plays back a for the King in dummy. Tackle the now, the Queen and Jack hold but West discards the 2nd round. So trumps and are 1-4.
This gets complicated.
Cash the Ace and ruff a small with the Ace. East discards something. Cross to the Ace and ruff a with the Jack. East will overruff, but now South has only trumps left, resulting in three trump tricks in your hand, one in dummy, three tricks, two in and the Ace of .
Without the double South will probably play va banque, double finesse in , and nemesis will overcome him. I wouldn’t double them, maybe it will gain +100 (or an unlikely +300), but warning the opponents into a thoughtful magic plan is a very bad thing.