[dicklont]

Lebensohl when partner doubles a weak two.

after (2♥) - Dbl - (pass)
i really like it when 3♦/♣ show real values so i need 2NT lebensohl for the weak hands.

[helene_t]

Right, Lebensohl is high on the list, forgot that one.

[skjaeran]

Drury and lebensohl would be very high on my list.

[cherdano]

Ok, if you want to know a situation where I think having good agreements is a big advantage compared to what I assume with a North American pickup expert then I would list:
1. any sensible Jacoby 2NT system gives an advantage over standard (but of course I don't expect it to come up in a 4 session event)
2. Good follow-up agreements to inverted minors
3. Personally, I much prefer getting the invitational 3-card raises out of the (then no longer forcing) 1N reply to 1M.

(No need to list drury or Lebensohl in reply to Greg's question since this is all part of NA expert standard.)

[Apollo81]

Preempting style and 2/1 style because there is a huge amount of variability in these areas from person to person.