The guillotine in my opinion is the most versatile submission in all of grappling. This choke can be used offensively standing as @briantcity showed, but also defensively to counter a takedown, used in the guard, while on top, to pass and to finish a takedown. All that is needed is wrapping your arm around the neck.
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Most submission holds first require positional control on the ground prior to initiating the submission, however with the ease of application this technique breaks this rule.
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