[flytoox]

Suppose you play precision, so 1D shows 11-15 and 2M shows 3/4 card support. Could anyone please recommend a good relay strucutre for
1D-1H-2H-2S
1D-1S-2S-2N?

Thanks in advance.

Hongjun

[mikestar]

Please specify the minimum length for your 1♦ opening--it can affect the answer significantly.

[Free]

What do you want to know exactly? 3M or 4M, shortness, length in other suits,...? It's necessary to know what the purpose of the relays are before constructing a scheme. Full relays will probably be quite hard (depending on your Diamond length after 1D openings, and if 1D-1H-1S is always bid, even with support).

[awm]

For whatever it's worth, here's what Josh and I play:

1♦-1♥-2♥:
... 2♠ = GF relay
...... 2NT = short spades, 3♥ only
...... 3♣ = short diams, 3♥ only
...... 3♦ = short clubs, 3♥ only
...... 3♥ = 4♥, no singleton or void
...... 3♠ = 4♥, 0-1♠
...... 3N = 4♥, 0-1♦
...... 4♣ = 4♥, 0-1♣
... 2NT = INV "relay" (NF)
...... Pass = minimum, 3♥ only
...... 3♣ = max, short spades, 3♥ only
...... 3♦ = max, short diams, 3♥ only
...... 3♥ = minimum, 4♥
...... 3♠ = max, short clubs, 3♥ only
...... 4♥ = max, 4♥ (usually don't show shortage here)

1♦-1♠-2♠:
... 2N = INV "relay" (NF)
...... Pass = minimum, 3♠ only
...... 3♣ = max, short hearts, 3♠ only
...... 3♦ = max, short diams, 3♠ only
...... 3♥ = max, short clubs, 3♠ only
...... 3♠ = minimum, 4♠
...... 4♠ = max, 4♠ (usually don't show shortage here)
... 3♣ = GF relay
...... 3♦ = short hearts, 3♠ only
...... 3♥ = short diams, 3♠ only
...... 3♠ = no singleton or void, 4♠
...... 3NT = short clubs, 3♠ only
...... 4♣ = 0-1♥ and 4♠
...... 4♦ = 0-1♦ and 4♠
...... 4♥ = 0-1♣ and 4♠

Of course, our 1♦ is normally balanced or three-suited, could be short diamonds but will not be a diamond one-suiter (so no 6+♦ hands, also no 5cMs). The patterns here are that bidding 3M always shows four cards and a balanced hand, and otherwise we show high/middle/low shortage in that order (same as symmetric relay typically). We're not trying to get opener's full pattern here (although this is sometimes possible especially after a three-trump raise); normally our goals are to determine number of trumps and location of short/weak suit. If we were to add another relay after the bids showing "shortage, three trumps" I think the priority would be distinguishing small doubleton vs. singleton vs. void. We also like maintaining a NF 2NT bid by responder, so we use the lowest suit as the relay.

[flytoox]

1D shows 2+. As I play 14-16 NT, so 2M raise essentially shows 11-13 HCP.