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IMPs (International Matchpoints): A scoring method
in which the difference between a pair's score and some other score is
converted to an IMP score using a roughly logarithmic scale. In conversion,
it is spoken of as "IMPing." In a team game, you IMP against the other
table's score. In IMP Pairs, the IMPing may be either against some sort of
average of all the other tables, or individually against each other table.
This definition assumes there is no competitive interference. If there is interference, most partnerships revert back to Standard American style. The auctions 1C-P-2C and 1D-P-2D both show at least 4 card support and at least 11 HCP. As a rule, the 2C and 2D bidder has more that 4 card support. Both auctions are forcing to 3NT or 4 of the agreed upon minor suit. The openers FIRST responsibility is to bid major suit stoppers up the line, thus 2H would show a heart stopper and would deny a spade stopper and 2S would show a spade stopper and would deny a heart stopper. 2NT shows stoppers in both major suits and (normally) a minimum hand 3NT shows stoppers in both major suits and (normally) a maximum hand.
All other rebids by opener are natural. Thus, a three club
rebid by opener would tend to deny stoppers in either major and show a long
suit and a minimum. The auctions 1C-P-3C and 1D-P-3D show at least 5 card
support for the minor and show less than 10 HCP. Opener can then proceed
according to their hand.
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