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In duplicate bridge only, game and partial-game bonuses are awarded at the conclusion of each deal as follows: any partial contract, i.e. one scoring less than 100 contract points, scores a bonus of 50 points, and; any game contract, i.e. one scoring 100 or more points, scores a game bonus of 300 if not vulnerable and 500 if vulnerable.
A K Q J 10 9 8 7 6 5 4 3 2: ... Contract bridge, ... The modern game of contract bridge was the result of innovations to the scoring of auction bridge by Harold ...
At Chicago or IMP scoring it is generally worth bidding game even with a slightly less than 50% chance of success due to the relatively high value of the bonuses (especially when vulnerable). In duplicate pairs scoring, the subtle difference between a major suit game, a NT game and a minor suit game make the declaration an important decision.
The first Laws of Duplicate Contract Bridge were published in 1928. [1] They were revised in 1933, 1935, 1943, 1949, 1963, 1975, 1987, 1997, 2007 and 2017. [2] The Laws are effective worldwide for all duplicate bridge tournaments sponsored by WBF, zonal, national and subordinate organizations (which includes most bridge clubs).
Hand patterns fitting these criteria are 4-3-3-3, 4-4-3-2 and 5-3-3-2 and represent 47.6% of all possible deals. Hands with a 5-4-2-2 pattern are considered semi-balanced and if included in the criteria for balanced hands would raise the probability of being dealt one of the four hand patterns to 58.2%.
2 ♣ is artificial and forcing; shows prospects for game; denies 4 spades if in response to 1 ♥. Direct raise of the suit is preemptive and sign-off. All other bids are "natural" and to play. Responses to 1NT 2 ♣ is a game-forcing relay asking for distribution 2 ♦ rebid is 4-3-3-3 distribution (so 18–22 HCP + Controls). Oriented ...
Suppose East is known to have 7 spades from the bidding and after seeing dummy you deduce West to hold 2 spades; then if your two lines of play are to hope either for diamonds 5-3 or clubs 4-2, the a priori probabilities are 47% and 48% respectively but (,,,) % and (,,,) % so now the club line is significantly better than the diamond line.
In the game of contract bridge, it denotes a hand of thirteen cards which contains no singleton or void and at most one doubleton. Three hand patterns are classified as truly balanced: 4-3-3-3, 4-4-3-2 and 5-3-3-2. The hand patterns 5-4-2-2 (an example of a two-suiter) and 6-3-2-2 (a single-suiter) are generally referred to as semi-balanced.