Any time you get your arms clinched the neck and arm whether from front or or , you've got a truly formidable control that is also very close to several submissions. Look for it when ever you can – it's almost always available from any neutral or other than closed guard or open guards where the opponent can control distance. Once attained – you immediately become a true menace to your opponent and he will have to get defensive immediately. It's a rather simple to apply (though controlling it for long periods of time against a skilled opponent isn't so ) that costs you in terms of risk and effort and yields great rewards – look for it every time you spar!