This hand appeared in one of chinese national match.the dealer of 6♦ was a chinese famouse player ever be a membe of national team.Because of no enough time to think,6♦ down 1.I was a spector.I felt it can be made.so i recorded it ,think it .I don't know the means of bids all too. But i can explain some of them. first , LHO double 6♣,maybe he want partner back c,give him a ruf,if partner can entry. second ,west first lead ♥A,maybe afraid dealer ,♠void ,♥ singleton,and dummy have ♠A ,lead ♠let dealer discard ♥.He didn't think to dealer ♥ void. last,i note the 4♦ open is namyats and give a reply,but u don't pay attention to it enough.it's means west's ♣suits is impossible be KQ or K10,because at most one A or K can be in side suits.