Bücker Stefan. Groteske Schacheröffnungen: Wagnis mit Methode

Stuttgart: Franckh'sche Verlagshandlung,W. Keller, 1990. — 160 p. — ISBN: 3-440-05770-4.White contests the center immediately with an early d5 which is not true of a Rat or a Hippo. What makes the UA good for a beginner is that they can always get to a middlegame after the following five move I played with Black in all my games in the 1994 Golden Knights:1...g6/2...Bg7/3...e6/4...Ne7/5...O-O. I have now reluctantly concluded that Black should try to reach universal structures by contesting the center immediately i.e. meet 1.d4 with 1.d5 (This actually will tend to be a UA by transposition after say 2.c4 c6 & see whether the UA structures are possible.