In the game of contract bridge Fantunes is a natural bidding system that was created and played by Fulvio Fantoni and Claudio Nunes of Italy, players ranked first and second World Grand Masters respectively according to the World Bridge Federation, as of June 2011.[1]
The Fantunes system differs in approach from other bidding systems used by world class bridge players. Opening bids of one and two of a suit are stronger than in most systems, with one level suit openings natural and forcing one round, and constructive 2-level openings. The one notrump opening denotes a balanced or semi-balanced hand with 12-14 HCP which can include a singleton.
Opening one of a suit is natural but forcing, unlimited in strength that contains at least 14 high-card points (HCP).[2] An exception is made for opening 1♠ or 1♥ with as little as 11 HCP when holding five cards in the bid suit and four cards in the other major. For example of such a "light" opening bid, consider ♠ AJ853 ♥ JT852 ♦ 9 ♣ KQ. With this hand, second seat at both vulnerable, Nunes opened 1♠ and alerted it as 14+ HCP or 11+ with 4+♥ (he meant 5+♠ as well). The 14-HCP minimum for an opening one bid is only a guideline; a hand with a lot of "playing strength" can be opened one of suit with fewer HCP. Here are three examples where they opened one of a suit without 14 HCP.
Opening one no trump (1NT) means 12–14 HCP and a balanced or semi-balanced hand, possibly a singleton with three four-cards suits and can include a 5-card major.
Opening two in a suit is natural, showing a hand with unbalanced distribution and limited in strength. In the first and second seat, two level opening bids denote 10-13 HCP and at least a 5-card suit. Such 2-bids occur with a high frequency, and put a lot of pressure on the opponents. Unlike other 2-level openings in modern systems, which are usually limited to 10 HCP in strength, the 2-level opener can act more than once in a competitive auction either by bidding his other suit(s) or with a takeout double. In third seat the two level opening bids, particularly in the majors, have a much wider range, and can be as few as 6 HCP. On the Bridge Base Online they are alerting such 3rd seat opening bids as 6-13 HCP.
Other features of the system are Gambling 3NT, Negative 3NT, TURBO 4NT/5NT and RKCB for slam bidding.