Maybe I was a little gun-shy after going down one in 6♣ on two consecutive hands (once due to a 5-0 trump split), but I think the explanations could be better here.
4♣ is explained as "4+D; 5+S; 11-21HCP; 12-22 total points". Shouldn't 4♣ show extras, since a simple raise to 3♦ was available? Or, maybe 4♣ shows diamond support and a club feature, in which case it needn't include extras? Either way, the description needs work. What would 4♦ show instead of 4♣?
I wanted to bid 4♥ over 4♣, but the system said this would show 19+ total points. Can't this be cut back a little, since most people would make that bid with this hand? (Several other players did make the bid, ignoring the description.)
North's 5♦ bid is described as "4+D; 5+S; 11+HCP; 12-16 total points". How many total points does he have?

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