If East had taken his ace, South would have ruffed a heart later, removing the king and establishing his 11th trick.
This may have involved no more than removing the former king from one monastery, where he had friends and influence, to another where Drest's partisans were in control.
Soyo sent a force yet again into Kongo and removed the king from power.
South won, ruffed a heart, and ruffed a club high, removing the king.
When he did not, the ace was played to remove the king, and another club lead guaranteed the ninth trick in that suit.
This removed the king, and the club ten was discarded.
Promoting a pawn to another piece (when it reaches the last rank) is called a "touchdown," and removing the king from check is "avoiding the sack."
Ordinarily pushing is the most common way of removing the king from the hill, but there are significantly rougher variations where punching or kicking is allowed.
There are three possible ways to remove the king from check:
He led to the spade ace, repeated the diamond finesse to remove the king, exited with a spade.