The Dutch- often viewed as borderline unsound by masters, but is still occasionally seen, usually as a surprise weapon. I sometimes play the Modern Stonewall Dutch. It has some obvious defects in that you spend many early moves not in developing pieces but in building the "stone wall" and you have serious dark squared holes. But having played against it I know it can be extremely annoying!
Anyway my point- I have a booklet on the Dutch from the 90s and one of the variations mentioned is Zhenevsky's system. I didn't have high hopes for this but after playing this position
Chessmaster 10's evalution was about 0.45- which is actually better than most King's Indian variations. After playing ...Nc6 Black seems to have a cramped yet solid and flexible setup. The king might want to move to h8 to avoid nasty tactical tricks though.