Eleanor Burns publishes a slightly different version that uses only 4 half square triangles in the entire block. This version is called "Winning Hand" . It looks like the regular card trick block when your're finished.
If you want to do the Card Trick version with half and quarter square triangles, there are pretty good instructions at: www.quilt.com/Blocks/CardTrick.
I've done both versions and for me, the Winning hand was easier and I couldn't tell the difference between the two assembly techniques when I was finished.