South drew the last trump and played a club to the king on the board.
Now South had to find a way back to his hand to draw trumps.
He won this in his hand with the king and drew trumps.
South could have drawn the last trump but made the better play of a diamond.
As it was, however, South had to draw the missing trump.
South saw that this was no time to draw trumps.
Here, the king comes down, allowing South to draw the last trump and to claim.
When this succeeded, he was able to draw the last trump with the king and make his game to win the board.
Better was to draw the missing trump by leading to the jack and then play a club.
He could and did draw the last trump but had only nine tricks.