MOST declarers realize the advantage of playing low from dummy when the queen is led through a king at trick one. The ace is almost certainly over the king and by playing low once or twice from the dummy the ace may fall on the right, establishing the king as a trick.

However, there are also many other holdings where declarer can gain a full trick by playing low from dummy in situations that are not as well known.

MY first example is from the final stages of an international trial:

     ¹  transfer to hearts

^2·  game force

³  slam try

   ⁴  we were behind at the time

When West led the five of diamonds (playing third and fifth leads) I immediately played low from dummy. Why? Why not play the jack, hoping that West had underled the queen?

Well, if West really had led away from the queen, East was going to have to make a pretty good play of the ten from A10 if he happened to hold that card. Most players would play the ace. Besides, there was a strong possibility that East held both the ace and the queen, in which case playing the jack from dummy would be no use at all.

All in all, I felt the percentages were very strongly in my favour and that to play low from dummy was the best way to build up a diamond trick for a spade discard.

As it happened East, fearing his partner might have led from 53 doubleton, played the queen. I ruffed, entered dummy with a club and played the king of diamonds, covered by the ace and ruffed.

Dummy was re-entered with a club, the spade discarded on the jack of diamonds and a heart conceded to make the slam. Had I played the jack from dummy at trick one I would have gone down in the slam.

When West leads the four of diamonds (fourth highest) breathes there a declarer among us who would not put up an honour from dummy at trick one? The result of this play is that if East wins and does not return the suit (allowing South to discard and then discard again upon the established diamond honour) South will lose a trick in each suit outside trumps and make only ten tricks.

Now let's see what happens if South plays low from dummy at trick one. It is going to take a pretty brave East player to insert the nine and run the risk of losing to a singleton ten in declarer's hand, or possibly a doubleton ten if West's lead was from K84 originally.

Most East players will surely play the ace. This will enable South to make a routine loser-on-loser play in diamonds for the precious overtrick (South runs the queen discarding a club, and later discards a heart on the jack.)

The play also picks up a trick when East started with both the ace and the king but not the ten. Surely nobody (unless he has read this BOLS tip!) would insert an eight or nine from AK9x or AK8x when dummy played low. Right?

The next hand is also from Pairs play and again resulted in declarer managing an overtrick for a top score by making an 'unusual' play from dummy at trick one.