Kangaroo Defense
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The Kangaroo Defense, or Keres Defense, is a chess opening characterized by the opening moves 1.d4 e6 2.c4 Bb4+ (in algebraic chess notation). White can respond 3.Nc3, 3.Nd2 or 3.Bd2 (the only other legal move, 3.Qd2??, loses the queen). The game often transposes to a Dutch Defense, a Nimzo-Indian Defense, a Bogo-Indian Defense, a Queen's Indian Defense, an English Defense, or a Queen's Gambit Declined. 3.Nc3 is likely to transpose into one of those openings: 3...Nf6 (Nimzo-Indian Defense), 3...f5 (Dutch Defense), 3...d5 (a slightly unusual sort of Queen's Gambit Declined), or 3...b6 (English Defense). Black has the same options after 3.Nbd2, except that 3...Nf6 4.Nf3 is a Bogo-Indian Defense. After 3.Bd2, Black can play 3...Bxd2+, 3...Qe7, 3...c5, or 3...a5. 4.Nf3 in response to any of the latter three moves transposes to a Bogo-Indian.
Note that White can vary with 2.e4, when Black must decide whether to play 2..d5 (the French Defense), 2...b6 (Owen's Defense), or 2...c5 (the Franco-Benoni).
