A natural system is a bidding system which is mainly composed of natural calls. Natural systems are classified as green sticker by WBF. Examples of natural systems still in widespread use include:
The classical natural system refers to the Culbertson system and the Goren system, developed between 1930 to 1950. Their main features are:
Many of the above aspects are now replaced by improved treatments and/or conventions.
Pages in category "Natural systems"
The following 6 pages are in this category, out of 6 total.
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