Cyberyeti, on 2011-November-08, 12:45, said:
One flaw in the analysis, opener could have 5♥, 4♣ and an 11 count here. Would be slightly embarrassing if this was the case and partner actually had a hand. It can't be unlikely (particularly if you play weak/strong 2 suited bids) that partner has 5-4, 6-4 or 5-5 in the blacks with AK/A and that 4♥ is cold.
Indeed
Why can't your partner hold
♠KQJxxx
♥
♦KQ
♣xxxxx
even if a Michael's cue was available then he would something rather incredible from partner to make anything other than a spade's contract so he doesn't use it.
4 ♥ is easy even with four card balanced opening.