In a natural system this is easy if you have exclusion blackwood available. In relays however, you have to show your hand. Distributions with 8 cards or longer are normally excluded from the relayscheme, so you have to show them as another shape (example: 8320 as 7330). Extreme hands normally have to deal with intervention, so it's not a big problem...
My partner started with 1♣ showing 15+HCP any distribution.
I respond 1♥, showing GF with 4+♠.
1♠ response from partner is relay.
My 2♦ bid shows a singlesuiter with 6+♠.
Now partner asks more information (exact shape) with a 2♥ bid, which gets me in big trouble!
- I can hardly lie about 3 cards, since we might end up in the wrong contract (a 5-1 where partner thinks I have a 3 card), and if I lie, what distribution should I show? 7330, 7231?
- I can't lie about my strength, since the slam methods will be a disaster later on
- If I decide to show it as a 7330 (3NT bid), then partner is allowed to pass
So I just bid 7♠, since partner probably has 0 or 1 ♠, he didn't reverse the relays so he's not minimum (or with 2-3 ♠s), and even if we miss an Ace we still have chance if opponents make a wrong lead.
The full auction:
1♣ - 1♥
1♠ - 2♦
2♥ - 7♠
Contract

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