It's called reading the cards.
That is a common quote from me when it comes to teaching people games and showing them tricks and effects that are a little more obscure than the norm.
So why is this phrase so important? Well the more you know about a game and its mechanics the better you can manipulate them in your favor. Heck even in my own blog I've a perfect example of that. Just take a look at the comments from Circles of Annoyance and you'll see what I mean. In that same tournament I could have won a turn earlier but the rules were not followed exactly so the odd thing crept through there.
Now while this might seem to you like a pointless exersize I have a few examples which I hope will show you the importance of this along with a few tips on how to make things easier on yourself.