RE-ENTRY CARDS
It is of little use to establish a suit unless it is possible to get the lead in the hand that contains it; therefore, the reservation of a re-entry card in the hand that has the long suit is of great importance. A preferable re-entry is, of course, the last trump or trumps.
Arranging the trump lead so that the last round will be taken in the desired hand is often a necessary precaution.
After the adversaries’ trumps are exhausted, you may be compelled to place the lead in the opposite hand by an extra round of trumps, and often it is necessary to trump with a high card, saving the low trump to lead to the opposite hand.
It not infrequently happens that in order to get the lead in the opposite hand, you are forced to trump your own commanding card.