Vampyr, on 2016-May-12, 09:44, said:
if you are going to play odd/even discards, be sure to discuss the correct card from lots of holdings. This system was only relatively recently permitted in the EBU because of tempo issues.
To Art: I don't play xyz, and have just looked up what I assume is a popular way to play it. It seems that you lose: 1. The ability for responder to make an immediate invitational suit bid (yes, I guess you can show this hand, but the auction could get murky ie wrt length, and/or interference makes it impossible t show the hand-type. It seems to me that you can better afford to stay lower with the GF hands. 2. The ability for responder to show a preference for clubs without climbing to the 3-level. Could you explain the advantages compared to 2-way checkback plus 4th suit GF?
XYZ allows you to make invitational calls without having to get to the three level. It also allows you to create a game forcing and game invitational situation without any ambiguities. I have played bridge for over 40 years. I still have issues with checkback sequences and 4th suit forcing sequences. XYZ eliminates the ambiguities.
After any sequence that starts with three bids at the one level (1x-1y-1z), 2C and 2D are artificial. 2C is a transfer to 2D, and is either:
(1) Any hand with invitational values; or
(2) A weak hand with diamonds.
Obviously, in the case of the weak hand with diamonds, responder intends to pass the transfer. So opener, if he cannot stand to be passed in 2D, has to make some other call. That part is very self explanatory. Note that this method allows you to get out in 2D even if neither partner bid diamonds previously.
In the normal situation, opener completes the transfer, and responder makes some other natural call, and is guaranteeing invitational to game values. Opener is usually in a position to place the contract. This works great in many sequences as you can stay lower than the field. For example:
1C - 1S; 1NT - 2C*; 2D - 2S
Responder has an invitational hand with long spades. Opener can pass. In most systems, responder would have bid 3S over 1NT. If responder had less than invitational values with long spades, he would have bid 2S over 1NT.
1C - 1H; 1S - 2C*; 2D - 2S
Again, responder has an invitational hand - this time with a fit for partner's spades. Rather than bid 3S, as in most systems, he bids 2C followed by 2S. If opener does not have a game bid, he can pass, and the final contract is 2S instead of 3S. If responder had less than invitational values, he could have bid 2S over 1S without fear that opener will take him for any serious values.
I could provide other examples.
A 2D bid after three bids at the one level is artificial and game forcing. Subsequent bidding is natural. Game must be reached.
JUMPS by responder after 1x-1y-1z are natural and forcing.
The 2C game invitational call and the 2D game forcing call free up responder's second round jump for some specialized uses. A jump by responder after three bids at the one level is game forcing and natural. If he is jumping in his own suit, it sets trump and begins cue bids. These jumps are slam oriented hands. With hands with no slam interest, or, in the case of a rebid of responder's own suit, a suit that is not good enough to insist on it being the trump suit, responder bids 2D first to create a game force. As some have commented, this is the aspect of XYZ that is the hardest for those new to XYZ to get used to. Players are used to a second round jump as invitational. In XYZ, it is forcing and strongly suggests slam. This is true if the jump is a rebid of responder's suit, a jump raise of either of opener's suits, or even a new suit.
Establishing a game force and showing interest in slam at a low level is very useful. It allows the partnership to explore for slam without getting past the game level. If the partnership has other slam methods, such as serious and non-serious NT or cue bids, it meshes well with XYZ.
1x-1y-1z-2NT
To invite in NT, one bids 2C followed by 2NT. A direct 2NT bid as responder's second call without bidding 2C first is a transfer to 3C, which, in traditional XYZ, is always a weak hand with long clubs. However, one can add other things to cover special situations. In my main partnership, a 2NT rebid by responder (forcing 3C) followed by a suit bid at the 3 level shows a game forcing 4441 with shortness in the bid suit (a rebid of responder's first suit shows club shortness). If responder bids 2NT followed by 3NT he has a strong NT opening hand.
Other bids
Any reverse after 1x-1y-1z is natural and game forcing. For example, 1C - 1D; 1S - 2H is natural and forcing to game, showing 5+ diamonds and 4+ hearts.
I was just discussing with my partner the meaning of 1C - 1D; 1H - 1S. Since responder could have bid 2C or 2D to show invitational or game forcing hands, 1S should have a special meaning not covered by 2C and 2D. The meaning that we have agreed to is essentially a catchall bid - a hand where no other bid is appropriate. For example:
xx xxx KQTxx Kxx
Responder cannot bid 1NT with a doubleton small spade, he can't raise hearts or clubs, he doesn't have an invitational hand or a game forcing hand, nor does he want to force the bidding to drop in 2D. Passing 1H is a possibility with this hand, but it is far from desirable (and I could change the example so that it is 2-2-5-4). So 1S covers this situation. The 1S bid is forcing one round. Among other things, this allows opener to rebid 1NT to play.
Some standard partnerships use 1C -1D; 1H - 2S as fourth-suit forcing. This is incredibly awkward. That problem does not exist using XYZ. 2S is natural and forcing to game, showing 5-x-6-y. With a game forcing hand and only 4 spades, responder would bid 2D. And if responder had only game invitational strength, he would bid 2C. The rest of the bidding would be natural.
I could provide you with a printout outlining the XYZ methods that I play. The way that I play XYZ is not the only way to play it. There are variations. But all of them have one thing in common - the meaning of the 2C and 2D bids after three bids at the one level.