AL78, on 2020-June-26, 03:56, said:
Multi-Landy is just a step up from that, with 2♦ showing one of the majors, and 2♥/♠ showing five of that suit and four of a minor. It allows more opportunity to compete at the cost of not being able to immediately show a major. It is the second round bids I haven't got nailed down yet.
I have played Astro for years, because I learnt it a long time ago and almost everyone I have played with knows it. My main problem with it is it seems to be a good way of getting a bottom by going off in a seven card fit when we could have taken 1NT off. Might be better to play that the anchor suit has five.
Asptro is actually a good defence and even sees play at international level. Funnily enough, one of its drawbacks compared with Multi-Landy is regarded as being complexity.
For Multi-Landy, one set of follow-ups would be:-
2
♣
... - 2
♦ = relay, equal length or constructive
... - ... - 2
♥ = longer/better hearts
... - ... - ... - 2
♠ = 4+
♠, INV
... - ... - ... - 2NT = relay
... - ... - ... - ... - 3
♣ = min
... - ... - ... - ... - ... - 3
♦ = relay
... - ... - ... - ... - others = max
... - ... - ... - 3m = nat, constrtuctive
... - ... - ... - 3
♥ = 3+
♥, INV
... - ... - 2
♠ = longer/better spades
... - ... - ... - 2NT = relay
... - ... - ... - ... - 3
♣ = min
... - ... - ... - ... - ... - 3
♦ = relay
... - ... - ... - ... - others = max
... - ... - ... - 3m = nat, constructive
... - ... - ... - 3
♥ = 4+
♥, INV
... - ... - ... - 3
♠ = 3+
♠, INV
... - 2M = preference
... - 2NT = pick a minor (NB: standard Landy uses this as a forcing relay akin to 2
♦ followed by 2NT in this structure)
... - 3m = to play
... - 3M = PRE
2
♦
... - 2M = pass/correct
... - 2NT = relay
... - ... - 3
♣ = max with
♥
... - ... - 3
♦ = max with
♠
... - ... - 3M = min with M
... - 3m = nat, constructive
... - 3M = pass/correct
2
♥
... - 2
♠ = nat, constructive
... - 2NT = relay
... - ... - 3m = min with m
... - ... - 3
♥ = max with
♣
... - ... - 3
♠ = max with
♦
... - 3
♣ = pass/correct
... - 3
♦ = 3+
♥, INV+
... - 3
♥ = PRE
2
♠
... - 2NT = relay
... - ... - 3m = min with m
... - ... - 3
♥ = max with
♣
... - ... - 3
♠ = max with
♦
... - 3
♣ = pass/correct
... - 3
♦ = constructive with hearts
... - 3
♥ = 3+
♠, INV+
... - 3
♠ = PRE
--
There are plenty of alternatives though - most, for example, just play 2NT as asking for the minor over a 2M overcall and accept the resulting issues on constructive hands. It does help here if you also play Multi+Muiderberg for your openings, as you can use the same follow-ups to reduce memory issues.