(a) Playing teams, there is no problem making at least 3 tricks when the opposition suit breaks 3-2. You need to cater for the suit dividing 5-0 or 4-1
The solution is to start by playing low from the South hand and play the King from dummy.
You then play a low card from the North hand and cover whatever card is played by East. This ensures you only lose only one trick when East started with Q10xx
If East shows out on the 2nd round you play the Ace and then play low towards the Jack. This ensures you only lose only one trick when West started with Q10xx
When the suit divides 5-0 you’ll follow similar steps.
THE KEY POINT IS THAT YOU MUST START BY PLAYING TOWARDS THE HIGH HONOUR THAT ACCOMPANIES THE JACK.
(b) Playing pairs and trying to maximise the number of tricks, you need to play differently.
The solution is to start by playing low from the South hand and finesse the Jack. If this loses to the Queen, you then play to the King. This allows you to make 3 tricks whenever either opponent started with Q10xx.
This is significant better than starting with the Ace and then finessing the Jack. The recommended line gains whenever East holds Q10xx; playing Ace first only gains whenever East holds singleton Q.
THE KEY POINT IS TO RECOGNISE THE IMPORTANCE OF THE 9 IN PLAYING THESE SUIT COMBINATIONS.