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Dutch Kat --- White Geller system Black plays a Dutch Kat (... N-KR3 & ... P-KB4) White plays a Geller system (P-K4, P-Q4, P-QB3) 1 game, 2008 English English opening, various Black defences. 1 game, 1988 Hippo --- White Geller system Black Hippopotamus formation. White plays a Geller system with P-K4, P-Q4 and P-QB3. 6 games, 1967-2008 Hippo --- White two knights system Black plays a Hippo. White plays a two knights system. 5 games, 1991-2006 Hippo (or Modern) v broad White centre 13 games, 1952-2008 Hippo --- Saemish attack 1 game, 2005 Krazy Kat Krazy Kat (... P-KN3, ... N-KR3) 4 games, 1975 Modern, Averbach Modern, broad White centre, Black Averbach formation 3 games, 1997-2007 Sokolsky 1. P-QN4 8 games, 1980-1998 White king's fianchetto White king's fianchetto opening 9 games, 1975-1998 White P-Q4 or P-QB4 or N-KB3 --- Dutch defence 14 games, 1924-2006