For some it appears that congratulating partner with"Wdp" or "vwdp" (normally after achieving a contract) is a habitual response by Dummy after a board is completed. Whilst some people may take this as being supporting/and or courteous, in my opinion it is quite inappropriate, being ungracious and disrespectful to the defending pair. In many cases a contract is expected to make, so actually achieving this is no more than what should occur, yet partner still insists on an unnecessary "wdp". Consider: Bridge is a game of mistakes, In a case where a pair make an extra, unexpected trick it is more often than not because the defenders have erred. Thus "wdp" is not really saying "well done partner", but is rather inferring "you screwed up" directed towards the defenders. In my opinion a pair should be courteous and magnanimous, by accepting their achievement with dignified silence,sparing praise only for the occasional board that is particularly cleverly played out. In my own case I remain quite throughout the match/tourney, and only when all is done offer "Thankyou and Well played" to my partner. (NB I must confess that in the past I was a "wdp" player, until some lovely American lady pointed out to me (quite harshly) that "You don't say well done for shooting fish in a barrel".)