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All comments by Richard Granville
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This is why I ensured that MOSSO fully satisfies the criteria for EBU level 4.
4 minutes ago
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My guideline for WJOs is that a 3 level overcall corresponds approximately to the same bid made as a 1st seat pre-empt, at the prevailing vulnerability. I use the rule of 2, 3 and 4.

A WJO at the 2 level corresponds approximately to the same bid made as a 1st seat Weak Two, although I'll take more notice of the vulnerability than I would as dealer.

Note that these are guidelines, rather than strict rules. Overcaller will also take account of his holding in the suit bid by opener.
12 hours ago
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Opener passes 3NT regardless of his hand.
19 hours ago
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Ranges of 2-5 or 3-6 would work over a MOSSO 1 opening, but 4-7 point hands are more common. The 4-7 range also takes a little pressure off responder after 1C-1M-2C, since he's now never too weak to rebid his suit.


Incidentally a 2M response to a MOSSO 1 shows 6-9, for various reasons linked to the fact that 1 is forcing without a specific negative response.
Aug. 12
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The idea behind 2 is to give opener the chance to play the hand when responder has something like Axx Axx Txx QJ9x.

And using the 2 response to show 5 + 4 allows responder to show an awkward hand in one bid.

Even so, I still prefer to use the 2M responses to 1 as Weak Jump Shifts with about 4-7 points. Not only are they useful pre-empts, but they prevent responder from being silenced by opposition bidding after a 1 response.
Aug. 12
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It's “standard” for a 1NT advance of a takeout double not to be a weakness bid, although the precise requirements vary between partnerships, perhaps 6-10 points after a 1 opening. With no points you just bid an unbid 4+ card suit, or your cheapest 3 card suit if necessary. Partner shouldn't expect the sequence (1) dbl (P) 2 (P) to show any values - see my bidding problem https://bridgewinners.com/article/view/bidding-problem-2-reb7k4ew9t/ in which Richard Fleet's suggested hand was virtually spot-on.
Aug. 11
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In 2016 the 3m responses to a MOSSO 1 were approximately as you say, but we found that it could be difficult for opener to describe his hand when he has 17+ with 5+ spades (or when he is strong with clubs over 3). As Ronald says below (in a separate thread), 3-level bids should be even more specific.

There's really no need to jump to the 3m with a 6 card suit (or moderate 7 card suit) because you can just respond 1 and rebid 2m over the likely 1m rebid. See page 65 of “Polish Club International” for PC continuations (although we do something slightly different in MOSSO because opener's club variant could have as few as 13 points).
Aug. 11
Richard Granville edited this comment Aug. 11
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I've answered “regressive” in both auctions, but there's a case for playing the sequence (1) dbl (P) 1NT P (2) as forcing because with 5 hearts a 2 overcall would generally be preferred to a double on a moderate hand (see my recent poll https://bridgewinners.com/article/view/overcall-in-long-suit-or-double-2-z9vsx61320/ ).

By contrast, a minimum takeout double often has a 5 card minor and it seems silly to go down in 1NT when 2m is likely to be a better spot.
Aug. 10
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This isn't a good system because of the wide-ranging 2 opening. You'll lose far more with diamond hands than you'll gain with spade hands.
Aug. 10
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The MOSSO 1 opening is similar to Polish in some ways, so you might want to read http://bridgewinners.com/article/view/introduction-to-mosso-mosca-with-standard-spade-openings/ to see the issue from another angle. Page 4 shows the responses to 1.

In practice we've found (after more than 2 years of playing MOSSO) that the 3 level responses cause problems when opener is strong, so they're now only used on some tightly defined hands with a 7 card suit. I would expect these problems to be at least as serious in Polish Club.

For the record we now invert the 2 and 2 responses so that opener can more easily show long clubs when responder has diamonds, but this doesn't affect Michael's conclusion that 1-2 can't be a Weak Jump Shift.

Over a Polish 1 opening it's more helpful to follow the example of 2/1, where most people play a 2M response as weak. The full version of MOSSO now has some specialized 2 level responses to allow for the 1 opening being unbalanced, unlimited and forcing.
Aug. 10
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When I played Precision in the 70's and 80's (and also designed various enhancements to the system as it was in those days) the sequences 1C-1D-1M were indeed non-forcing, but I can now see that this is a terrible waste of two economical rebids. Nowadays I'm perfectly happy to play a 1 opening as forcing even when the minimum is about 13 points. This may appear to be ill-advised, but in practice it's rare for the forcing nature of a MOSSO 1 opening or a Precision 1M rebid to get the partnership too high when the opponents would not have competed.
Aug. 8
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Yes - I mean minimum with this particular shape and heart suit texture. Of course one can double 1 on weaker hands with 1=4=4=4 shape.
Aug. 7
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4 should make exactly 10 tricks whatever the lead, but it requires skilful play on any lead other than a spade. A heart lead is particularly challenging for the declarer.

I just thought that it was an interesting problem. My partner chose J and careful defence later resulted in one down.
Aug. 7
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I work on the principle that a minimum overcall should be based on a reasonable suit. Thus I agree with the pass on this hand, but add Q and I would venture 1, especially non-vulnerable.
Aug. 5
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I would probably venture 2 if non-vulnerable, but partner should expect a little more than this when vulnerable.
Aug. 5
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It's possible that we didn't make the most helpful call on the previous round. We could have started with a double, with the idea of converting a club rebid to diamonds. Then partner should realize that we have a maximum pass with 5 diamonds and 2 hearts.
Aug. 3
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If 2 is non-forcing (not an uncommon treatment) the system as described is unplayable because there then would be absolutely no way to show hearts in a forcing situation. I therefore conclude that 2 must be forcing in this system.
Aug. 3
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Tom, can you provide a reference or link to this?

Transfers do seem the way to go after 1m-1M-2m, but the many sequences require a lot of working out. My early attempt in
https://bridgewinners.com/article/view/transfers-after-1m-1m-2m-more-details/ has since been refined for MOSSO. I play this approach with my two MOSSO partners and it works very well. I haven't persuaded any of my 2/1 partners to try it, but few changes would be required for 2/1 and it should be effective with that system too.
Aug. 2
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I might overcall 1 if non-vulnerable.
Aug. 2
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Whatever the answers to the above questions, Two-Way Checkback (i.e. 2 Puppet to 2 and 2 a GF enquiry) is surely a simpler and more effective approach to continuing after a 1NT rebid.
July 29
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