The players register already in couples, indicating  who is player 1 and who is player 2.

Each encounter between couples takes place in three phases:
1. Player 1 of couple A plays against player 2 of couple B; at the same time player 2 of couple A plays against player 1 of couple B;
2. Couple A plays against couple B exactly as in a “double consultation”;
3. Player 1 of couple A plays against  player 1 of couple B and at the same time player 2 of couple A plays against player 2 of couple B.