When the game starts, the starting player should play any of the face up cards from own stack. If the second player currently has face up cards that are of the same suit as the card played, he has to reply with one of those cards. If, however, the second player does not have a card of the same suit, he can play with any other card including a 'trump' card.
If there is at least one 'trump' card, the highest 'trump' wins both cards.
If there is no 'trump' card, the highest card of the suit played by the starting player wins both cards.
If the replying player has no card of the requested suit and no 'trump' card, he has to play any card and the starting player wins both cards.
The player who wins the round leads the next one.