1C-1D!
1S-2H!
1C: You play 5cM and 4cD, 1C can sometimes be a douleton...not now.
1D: transfer Walsh, Promises Hearts
1S: 4 card S, forcing. No 3 card H (can hold 3 card H if strong)
2H: 6 card H with 8 to 10 HCP. Partner could have bid 2D on first round to show a 6 card Major with 4 to 7 HCP.
You have slem if partner holds ♥KQ and ♣K.
You have no hard agreements about this, but from the general agreements you have with your partner you expect that he will understand following bids:
- 3♦: 4th suit GF
- 3NT: to play
- 3♠: ♥-fit, cue (not sure he will take it like that, but you can bid 3♦ if strong with 5-6 in black suits and no ♥-fit)
- 4♣: ♥-fit, cue
- 4♦: ♥-fit, splinter
- 4♥: to play
==> Do you try to find slem?

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