The opening of the base 3 can serve to confuse the opponent that can not give each other information, so that the opponent loses control of his best contract, this opening will be effective for the offensive, but to state this kind of defensive cards less useful.
Opening 3C, 3D, 3H, 3S also called Pre-emtive bid
Pre-emtive not show a strong card, but otherwise showed a weak card and did not even qualify for the opening of the opening level 1 and level 2, but has a particular color or colors offered long sheets having a minimum of 7 pieces, at least seven victories for the state of danger , and the sixth victory in a state of danger, that the contract is willing to take risks down to not fulfill the contract, let down in a state of danger or 2 down 3 in a state of danger.
Contract must obtain a minimum of level 3, 9 Victory to fulfill the contract.
Example: Pre-emtive card hand 3C
♠- 952 or ♠- Q1073
♥-7 ♥-
♦-105 ♦-86
♣-AKQ10974 ♣-AK109874
Example: Pre-emtive card hand 3D
♠- K84 or ♠- 53
♥-10 ♥-10
♣-5 ♣-K10
Example: Pre-emtive card hand 3H
♠-32 or ♠-
♥-AKJ10854 ♥-KQJ109854
♦-Q64 ♦-A2
♣-9 ♣-1086
Example: Pre-emtive card hand 3S
♠-KQJ10963 or ♠-AKQJ1096
♥-A4 ♥-74
♦-1064 ♦-62
♣-8 ♣-93
The example above is one of the opening level 3 or Pre-emtive bid but the combination and distribution of cards is varied during our many practice we will have a lot of diverse card distribution as long as it does not violate the terms of the pre-emtive we should not hesitate to do the pre-emtive bid to become the opponent confused and could not communicate in the bidding.
So from the example of opening a 3D card can be concluded at least 7 pieces offered on the card and have a 8-10 point.
examples of bidding
S W N T
3C ? pass ?
East and West will find it hard to communicate if the handle can only be for the opening at level 1 or 2.
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