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I recently took a first air course. I was told abdominal thrusts were the first course of action. If the person is obese and you can't get your arms around them, you should try back blows first. You have the person bend over and give them hard palm strikes in the back, not slaps. If you still can't get the obstruction out, the last option is chest compressions, but that's likely to break ribs in the process.
Chest compressions is for when the heart stops, and actually won't do anything for choking. Abdominal thrusts, where you put pressure on the diaphragm (not the ribs) is for choking. Also, if you do chest compressions for a stopped heart, you're going to break a few ribs. Unless you're doing it wrong.
Chest compressions force air out of the lungs pretty violently. If there's a blockage in the oesophagus, and you can't perform abdominal thrusts (due to obesity for example), chest compressions are an acceptable alternative.