Take a club in your hands and grip it with the shaft at chest height in front of you.

Now:
1. Hinge the wrists up-and-down like a fishing rod. See how the club face doesn't open or close? That's a proper wrist hinge.
2. Now hinge your wrists left-to-right like you would a paint brush on a wall. See how the club face opens and closes? That is what happens at the top of the swing if your wrists or cupped or bowed. Cup your left wrist ... see how the clubface is open? If you're in that position at the top of the swing - the club face is open and unless you correct it on the downswing - you're going to cut the ball.

Ideally, your wrist should be flat at the top of the backswing (i.e. no left-to-right hinging). If it is, the club face is square.

__________________
Golf is easy ... once you know how.
Graham Arnott, teaching professional
Kelrosa Golf Studios
www.kelrosagolf.com
Class 'A' PGA Member
Full Member: World Golf Teachers Federation (GB&I)