This excerpt taken from the CHK DEF 14A filed Apr 30, 2009.
PLEASE DATE AND SIGN ON THE REVERSE SIDE AND RETURN PROMPTLY USING THE ENCLOSED ENVELOPE.
Date , 2009
IMPORTANT: Please date this proxy and sign exactly as your name appears below. If stock is held jointly, signature should include both names. Executors, administrators, trustees, guardians and others signing in a representative capacity, please give your full titles. If a corporation, please sign in full corporate name by president or other authorized officer. If a partnership, please sign in partnership name by authorized person.