The Romex system is a contract bridge bidding system designed by Mexican bridge expert George Rosenkranz . Key features of Romex are the multiple meanings attributed to certain bids, such as the dynamic one notrump and the Mexican two diamonds.
11-434: The Kaplan–Sheinwold (or "K-S") bidding system was developed and popularized by Edgar Kaplan and Alfred Sheinwold during their partnership, which flourished during the 1950s and 1960s. K-S is one of many natural systems . The system was definitively described in their 1958 book How to Play Winning Bridge and later revised and retitled to The Kaplan-Sheinwold System of Winning Bridge in 1963. Kaplan–Sheinwold and
22-408: A bid of 1 ♣ may not be related to a holding in the club suit. Natural system(s) are the " lingua franca " of bridge players, with regional variations. Thus, a new partnership can agree to play a natural system and understand each other fairly well. Players sometimes alter certain aspects of a system, adding their specific agreements or preferred conventions. Structure and meaning of opening bids are
33-530: A strong club with five-card majors. The principal features of K-S, as revised in the 1960s, are these: Bidding system A bidding system in contract bridge is the set of agreements and understandings assigned to calls and sequences of calls used by a partnership , and includes a full description of the meaning of each treatment and convention . The purpose of bidding is for each partnership to ascertain which contract, whether made or defeated and whether bid by them or by their opponents, would give
44-524: A system closely modeled on K-S, with loads of gadgets. In the late 1960s, the Precision Club system grafted a strong, forcing opening of 1 ♣ onto K-S, in effect following earlier suggestions by Marshall Miles that five-card majors and the weak no trump be added to the Schenken system . Kaplan viewed Precision with distaste, noting the disadvantages, both theoretical and at-the-table, of combining
55-458: Is a potential contract. By the rules of the game, the agreed meanings of all calls must be public and known to the opponents. In normal club or home play, the opponents are entitled, at their turn to make a call, to ask the partner of the bidder about the meaning of the call. In high-level tournaments, where screens are used, the procedure is to ask the screen-mate about their calls as well as their partner's calls. In serious online tournaments,
66-637: The Roth-Stone system were the two most influential challengers to Standard American bidding in the US in the 1950s, 1960s, and 1970s. Although K-S is not frequently played in its original form in the 21st century, many of its features (though not the 12–14 point 1NT opening) survive in the popular 2/1 Game Forcing system. Additionally, a few elements of Kaplan–Sheinwold (notably Five-Card Majors) have become accepted as part of Standard American practice. Among modern experts, Chip Martel and Lew Stansby play
77-479: The area of natural systems have resulted in systems that are natural in essence, but contain special features. Examples are systems like Romex , Boring Club , Fantunes , and EHAA (Every Hand An Adventure). Artificial systems can be further classified into: Romex system The dynamic one notrump opening indicates either: The most common responses to the dynamic one notrump opening are: Higher-level responses indicate control count . A consequence of
88-453: The common determining factor for system classification: in most modern natural systems, opening bids of 1 ♣ through 2 ♣ have the same or similar meaning, with level-one bids denoting length in a suit. Artificial systems typically reserve at least one one-level suit opening bid for special purposes, unrelated to the suit. Natural systems generally use opening bids as follows: The most widespread natural systems are: Various developments in
99-473: The partnership their best scoring result. Each bidding system ascribes a meaning to every possible call by each member of a partnership, and presents a codified language which allows the players to exchange information about their card holdings. The vocabulary of bidding is limited to 38 different calls - 35 level/denomination bids plus pass , double and redouble . Any bid becomes a contract if followed by three successive passes, therefore every bridge bid
110-414: The procedure is for the player making the call to self-alert it, but the explanation is visible only to the opponents. Bidding systems can be classified into two broad categories: natural systems and artificial systems. In natural systems, most bids (especially in the early phase of the bidding) denote length in the suit bid. In artificial systems, the bids are more highly codified, so that for example
121-406: The use of the dynamic notrump is that the 1NT rebid by opener becomes wide-range (typically 12-16 hcp). With game invitational values or better, responder reacts to such a rebid with a 2 ♣ checkback convention to ask opener to further describe his hand. This opening indicates one of four hands: One-level and 2 ♣ openings are as per Standard American with 3+ minors and 5+ majors and limited by
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