From a recent Gold Cup round 2 match
Non-vul vs Vul. IMPs Dealer West
What do you bid now ?
Seven hearts should be solid unless partner has three small diamonds. Simplest is to bid seven hearts and hope, most of the time partner will not have three small diamonds and even if he does there is the chance of a two-two split. However, there is a little known extension to RKCB. After Roman Key Card Blackwood has identified all of the controls a bid of six of a non-trump suit asks partner to bid the grand with third round control in that suit, so six diamonds is the recommended call.
Partner's hand was AKQ3, KQ82, QJ7, Q6 so both the agricultural and the sophisticated approaches would have worked.