[UdcaDenny]

Me and my partner are learning to play 2/1 and have different views on a bidding. He opened 1S in third seat and I bid 2D with 10p and Qxxxx. Since I was a passed hand its not gameforcing but shud show near openingstrength. My partner had a good opening and jumped to 4C with 5-5 in S and C but I thought it was a quebid accepting D as trumps. Wouldnt 3C, a new suit on the 3-level be forcing even if I was a passed hand ?

[Antrax]

Yes, 1♠-2♦-3♣ is forcing, regardless of 2/1. Whether it shows 5/5 or just extra values is up to you.

[Codo]

and yes 4 ♣ is doubtless a splinter in support of diamonds.

[cherdano]

It's forcing. However, I would try to avoid bidding 2♦ here with a suit of Qxxxx - if partner has a 5314 minimum, he is may well be forced to pass.

[helene_t]

Many 2/1 players play a 2♣ or 2♦ response by a passed hand as conventional since a passed hand can't have a game force so you have to play a different system after 3/4 seat openings anyway.

If you do want to play the 2♦ bid as forcing, you need to discuss which follow up are forcing. Here are some suggestions:

1) Play 2m as "forcing on responder", i.e. opener can always pass if he doesn't see game opposite a passed hand, but if he bids on he is unlimitted so responder can't pass below game.

2) Play 2m in the same way as you play a 2/1 in a contested auction. I.e. the rules are the same as after 1♥-(1♠)-2♦ when responder is an unpassed hand.

If you decide on 1) it may sound as if
pass-(pass)-1♥-(pass)
2♣-(2♦)-pass*
is forcing, but you probably don't want to play that way unless you don't open particularly light in 3rd seat.

[Free]

You seem to have a good understanding of bidding. 3♣ would be natural and makes the auction GF (with minimums opener should stay at 2-level), therefore 4♣ should be something else. In this sequence splinter makes most sense (no point in inviting at 4-level with a 5-5 without a known fit).

[Hanoi5]

You should probably bid a (semi)forcing 1NT.

[UdcaDenny]

UdcaDenny, on 2013-October-19, 04:06, said:

Me and my partner are learning to play 2/1 and have different views on a bidding. He opened 1S in third seat and I bid 2D with 10p and Qxxxx. Since I was a passed hand its not gameforcing but shud show near openingstrength. My partner had a good opening and jumped to 4C with 5-5 in S and C but I thought it was a quebid accepting D as trumps. Wouldnt 3C, a new suit on the 3-level be forcing even if I was a passed hand ?

I must correct something. My partner didnt have 5-5 in S and C. He had 6 spades and 4 clubs and 20 points.

[P_Marlowe]

UdcaDenny, on 2013-October-19, 21:42, said:

I must correct something. My partner didnt have 5-5 in S and C. He had 6 spades and 4 clubs and 20 points.

After 2D, either 3C (new suit on the 3 level) or 3S (showing add. values vs. a 2/1 response)
are gameforcing.
Since you are a passed hand, it does not matter, that you happen to play 2/1 game force.

With kind regards
Marlowe

[mycroft]

For that matter, pretty much anything (save 2♠, 2NT, 3♦ and pass) is forcing. Of course, that just punts the "I really have a slam try, partner" down the road to his next bid.

I can see partner with a huge hand wanting to show it; I can see responder thinking it's a splinter.

[ArtK78]

To reiterate what others have said, the 2♦ bid is not forcing, but it does show close to opening values - 10-11 would be typical. If your suit is Qxxxx, you should not bid 2♦ as you may wind up playing it there, especially if partner opened light. 1NT would be the right call. If partner passes 1NT (it is not forcing by a passed hand), then 1NT is probably the right place to play the hand.

Opener's rebid of 2 of his suit, a suit below 2 of his suit, or 2NT can be passed. Anything else by opener is game forcing, as it shows extras.

Any bid higher than necessary to show a suit naturally and be forcing is not natural (except for game in opener's first bid suit). So, on the auction P - 1♠ - 2♦; the bids 3♣, 3♥ and 3♠ are all natural and forcing, but 4♣ and 4♥ should be splinters in support of diamonds. 4♠ would be to play.

The partnership can certainly vary the meaning of these calls by agreement, but I would guess that these meanings are pretty standard.