Introduction to inquiry2over1
This electronic book details the bidding system that I play, primarily with BBO member MishoVnBg. Much of this system is modular. That is, even if you have no desire to play the entire system (some of this system is Mid-Chart and some Super-Chart), you may find some of the treatment/conventions highly useful.
This introduction provides the concept behind choosing the different aspects of the bidding system (details of which are found in the individual chapters).
An overriding concept of the Inquiry 2over1 system is to provide support with support. Both with and without competition, the system provides a number of ways to raise partner that show different stregth level. In general, DIRECT RAISES are weaker than non-direct raises [ 1H-2H, 1S-3S, 1H - 4H ] are all weak raises, in general, the higher the "raise" the more cards support.
This system is built upon another concept: Get in and out of the auction quickly. Towards this goal, Inquiry 2 over 1 GF opens nearly all hands with 26 ZAR points, and most hands with 25 Zar points when holding a four or more spades. However, some balanced hands with less than 26 ZAR points are opened, since our 1NT rebid shows 11-13 hcp. In deciding to open thes very light balanced hands with less than 26 ZAR points, deciding factors include: vulnerability and intermediate cards (tens). When vul at imps, we tend not to open these hands. The reason is partner will push to try to bid close games, and these hands are always a disappointment. Second, the penalty for overbidding vulnerable can be very high. At matchpoints, we tend to open these hands without regard to vulnerabilty. To find out more about ZAR points see http://www.aci.on.ca/~zpetkov/TheNeverMiss.html
The inquiry 2 over 1 system is a natural bidding system, but with some severe limits on the opening bid of one of a suit. This limitation (which mimic the limitations on the old Romex system with the "dynamic 1NT and mexican 2D") on the opening of one of a suit is useful for two reasons. First, since we open very light, the range from very light to super stong 1 bids is too wide for effective constructive bidding. Second, Inquiry 2 over 1 uses a variety of specialized auctions to show strong one, two, and three suiters. The availability of these "strong opening bid options" effectively limits the upper limit for all natural openings at the one level.
Here are the type of strong hands that ARE NOT opened at the one level.
Game force, open 2C
(22)23-24 open 2D (part of multi-2D)
Game force, open 2C
Game invite, major, open 2C (8 tricks, good suit, 5+ controls)
Game invite, minor, open 2D (9-9.5 tricks, part multi 2D)
Open 2NT, 3C, or 3D (MisIry Transfer Preempt), 4 losers or less,
All strong three suiters, open 2C, (15)16+ hcp, 5 or less loser, 5+ controls
These strong options mean an opening bid of at the one level can be characterized as less than an acol 2 bid in any suit, less then 20 hcp balanced, less than 16 to 18 if three suiter, and less than four losers with fair values if two suiter. If you think about it, these restrictions convey a lot of information. For example, if the bidding goes...
1H-1S-3H, how strong can your partner be? He couldn't open 2C with the strong heart opener, so this jump rebid in his own suit is limited. We "define" this hand by the fact that opener choose not to use riton 2C, a convention recently added to Inquiry 2/1