I tried to play with quattro again. Here you can see first try to get out of snow in reverse gear: success. After that I tried to make it throught snow but that did not work out. I was trying to get out for five minutes and I made it in reverse gear only after that time... One more problem was that rear difflock automatically disengages after some effort (related to speed). Now I plan to make another button to disable this feature.
audi, 200, 20v, turbo, quattro, stuck, snow, gas, pumping, difflock, differential, torsen, winter