[Cthulhu D]

I've been reading up about MOSCITO and several posters have stated that there is a new set of continuations for 1D/H openings that goes something like

1D:

1H: Invitational+ Relay or some NT hand
1S: Natural
1NT: TRF 5+ Clubs
2C: TRF 5+ Diamonds
2D: Constructive 3+ raise
2H: Non constructive raise.

But then say that you need to change the continuations for 1D-1H and 1H-1S to account for the NT option in responders hand. But no-one provides these - anyone tell me what they are or where I can find a writeup?

[Kungsgeten]

Hi! Now we do not play MOSCITO exactly, but our system has evolved into something like MOSCITO but may have more in common with Magic Diamond originally. Our 1D and 1H openings can not include 4333 or 4432. We use the following continuations (similar to what you've described):

1D--
1H = a) GF relay
     b) Weak balanced, usually 2 card support, wants to play opener's longest suit
     c) Constructive raise with 3 card support, about 8--10
     d) 4+ support and an SPL, either game interest or mild slam interest
1S = 4+ spades and forcing. Usually only 4 spades if balanced and INV.
1N = TRF 4+ clubs (can be 3+ after a 1H opening). If only (3)4 then balanced INV or INV with 5-4 minors.
2C = TRF 4+ diamonds (only 4 if balanced and INV). With 5D and 4C and INV we transfer to clubs first.
2D = a) Limit raise with 3 card support, about 11-13
     b) Constructive raise with 4 card support, about 8-10
2H = Preemptive raise with 3+ support and 0-7 hcp
2NT = INV+ with 4+ support
Other = Preemptive

The splinter alternatives in the relays could ofcourse be shown using jump shifts instead of playing jump shifts as weak. Here's a link to our system notes: system notes

The document may contain some errors since we've recently shifted the system from forcing pass to strong club.

[Free]

In the original version, there was no distinction between constructive and weak 3 card raises, 1♦-2m was natural, as was 1♦-1NT and 1♦-2NT. 1♦-1♥ was used as an INV+ relay without any weak options (because these bid natural). As a result, an artificial relay structure was possible (for example 1♦-1♥-2♦ showed a singlesuiter, after which 2♥ was a GF relay).

However, when you include the weak NT hands (invitational are also included, but not relevant for this argument), opener's rebids must be natural so responder can pass. Also note that opener can no longer have a balanced hand in newer MOSCITO versions, so a 1NT rebid is used to show exactly 4♥ with a longer minor. The relay 'structure' after 1♦-1♥ is:
1♠ = 4+♥ and 4+♠
...1NT = NT hand without fit, less than invite
...2♣ = GF relay
1NT = 4♥, longer minor (some also include 1=4=4=4, but I prefer to open these 1NT to keep this rebid 'pure')
...2♣ = P/C
...2♦ = GF relay
2♣ = 5+♥, 4+♣
...2♦ = GF relay
...2♥ = preference
2♦ = 5+♥, 4+♦
...2♥ = preference
...2♠ = GF relay
2♥ = 6+♥
...2♠ = relay

As you can see, some relay modules (singlesuited for example) now end up higher than before. Similar distributions no longer pattern out at the same level (for example all 5431's ended up at 3♦, now they don't). This makes the relays less efficient in most cases, but the extra options you create are well worth it imo.

The same goes for 1♥ openings, where again you need to make a decision what you do with a 4=1=4=4: open 1NT or put it in 1♥-1♠-1NT.

[Kungsgeten]

Interesting, I haven't seen Moscito's relay responses before. Our 1red openings allow for 5332 with a 5 card major. The responses to 1D-1H are:

1S = 4+ hearts, 4 spades (not longer spades, so 4441 if only 4 hearts)
1N = 5+ hearts, not 4 spades, or 1-4-4-4 (can be included into 1NT opening instead, as Free suggested)
2C = 4 hearts, 5+ clubs
2D = 4 hearts, 5+ diamonds
2H = 5+ hearts and a 5+ minor
2S = 6+ hearts and 5 spades

This structure makes it hard to find a 4-4 minor fit, so we usually play in a 5-2 major fit instead.