13th January 2021
Board 28 from the Manchester Congress Pairs event featured this suit play.
S A1098743
   
S 2

How should you play this trump suit?
Scroll down to see the solution and the full deal.

Dealer West
 S
 A1098743
    
N-S Vul
 H
 4
    
    D J1043
    
    C 10
    
S
 KQJ5
     S
 6
H
 K632
     H
 QJ5
D
 5
     D
 9862
C
 Q932
     C
 K7654
    S
 2
    
    H
 A10987
    
    D
 AKQ7
    
    C
 AJ8
    

South
 West
 North
 East

Pass
 3S Pass
4S Pass Pass Pass

East led the diamond eight won in dummy and declarer played a small spade, West following smoothly with the five.
If trumps break 3-2 then there are only two tricks to lose, if they break 4-1 then if East has a singleton honour then it is right to play the ace, if East has a small card it is right to play the ten.  Since there are three honours missing and only two small cards the ace is the percentage play.

Those who played the ace won the postmortem, those who played the ten won the matchpoints.