3rd Chair Openings
For example, Hardy says to pass with K6-Q973-KJ6-QT75 because: You would like a Club lead, but you are not prepared for a response of 1.
We have adopted these ideas for 3rd seat 1-level openings in BidBase.
Since your partner has already limited his hand by not opening, you don't have to worry much about missing game if you have a minimum opening bid or less.
Therefore, you can afford to preempt with hands which are STRONGER than normal in order to obstruct the opponents as much as possible.
For example, with 2-32-KQT2-KQJT32, you would usually open 1 in first seat, but in 3rd seat, it is correct to open 3.
In addition to jamming up the player who is likely to have the best hand, your bid is also lead directing for partner, since you would not make the bid without a good suit.
If partner opens a major, you can use a Drury 2C response to show support for his suit plus 10+ HCPs and to ask him to show if he made a weak opening bid.
If partner opens a minor in 3rd seat with a subminimum hand, he will pass a 1 or 1 response by you, so with a maximum (11-12 HCPs), you must jump to 2 or 2. With a flat 11-12 HCPs, jump to 2N.