There's Ki ken tai no ichi.... buuuuut I'll go with cunning. I usually try to hide behind one of the shinpan, then I sneak up behind him and BAM-O! Ippon! The other thing is to bring shrubbery to the shiai. Hide behind the shubbery until you can jump out and score a quick point. These two techniques, or waza if you will, require the utmost cunning.