Example of Play mode.

When in play mode you can turn on a display of the optimum contract result after the play of each legal card to the current trick.  The screen below for example shows West about to play to trick 2 of a 3N contract.  The display shows that leading the club Q lets the contract make, leading the 10 lets through an overtrick, but leading any other card takes it one off.  As you go through the play you can see this display for each hand in turn for each trick.  This is a very useful feature when learning advanced play techniques like squeezes, striipping safe exit cards and throw ins: