Very often, when you attempt one submission and it doesn’t work, you lose position and end up in an disadvantageous position. Guillotines come to mid:
Setting Up The Guillotine Without Losing Position & Compromising Yourself
In order not to lose position, it’s always good to have a trick up your sleeve, and attack with combinations.
3x ADCC world champion Kyra Gracie , is a specialist in such submissions and fortunately for us she presents her signature combination from the mount position: No Gi Ezekiel to armpit arm lock.
This is a brilliant attack chain since it relies on the opponent defending and you taking advantage of the arm in front to set up the armpit armlock.