This is an "intra-finesse," allowing the queen to be led later from the closed hand.

She played the club queen, and South, with something to think about, allowed the queen to win.

This allows the queen and knight to develop a fulminant attack.

South naturally assumed that the ace was on his right, and played low, allowing the queen to win.

Allowing the queen to win would hold South to three tricks in the suit.

South won with the king, led the diamond jack and allowed the queen to win in the hope of an even split in the suit.

South allowed the queen to win and a second diamond was won with dummy's ace.

West allowed the queen to win, and took her ace when the jack was led.

Another club collected the jack, and East allowed the queen to win.

So he kept himself alive by allowing the queen to win.