When playing a contract to win all the tricks, declarer can elect to stack the tricks. In this case the third trick is stored on top of the first, the fourth on top of the second, and so on, leaving only two previous tricks visible at one time. This saves space and reduces the players' opportunity to chack back to see what has already been played. Declarer's partner turns all her dominoes face down and takes no part in the play. The declarer leads to the first trick, and there are no trumps.
Rules of play are as usual, and a lead of a double calls for doubles.
If a non-double is led the larger number determines the suit to be followed, and a double cannot be played to the trick unless no dominoes of the suit led are held. The declarer must hold at least 4 doubles to announce Plunge . Delarer leads, and declarer's team must take all seven tricks to win. To play a Plunge, declarer must have bid at least 4 marks. In order to play a plunge, declarer is allowed to open the bidding with 4 marks, or jump to 4 marks over any lower bid, or bid 5 marks over a previous bid of 4.