ive taken accidental hard hits in sparring in each place (haven't fought properly yet) that have caused me to sit out. the solar plexus was more debilitating than painful because it took my air, whereas the shot to the liver was debilitating *because* it is that painful
watching fights it seems to me that liver shots are more likely to give a ko, whereas the solar plexus is more likely to get an 8 count. idk, casual observations