East bid 3♥, intended as a splinter for spades. West did not understand this but that's not such an interesting problem. A more interesting problem is what agreements EW should have that allowed East to express all if this:
- I have GF values
- Spades are trump, I might want to include in the king of spades in a keycard ask
- I have a strong diamond side suit, does that make your hand improve?
Without specific agreements, I think it could have started
X-2♥
2♠-3♦
4♦-4♥
4♠-4NT
.... but now diamonds are trump. An additional complication is that South, who doubled 3♥ (she had a 7-card) might have bid 3♥ over 2♥.
A more radical solution I thought of (after having read the Robson/Segal book) was to define an immediate 4♦ by East as passing all three messages at once.
Any thoughts?

Help

---- (----) Pass-(1♥)
X-(pass)-?