In order to finish a match via triangle you need, besides the neck, one of your opponent's arms trapped between your legs -- right? Sort of, because there is also the possibility of achieving the submission without that arm. Márcio André shows here a step-by-step no-arm triangle he used in this year's European Championship.
The principal detail is putting your hand on the inside of your foe's arm until you hold the collar. The triangle, even without their arm, completes the pressure for the choke.
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