A chess opening named for Octavio Trompowsky of Brazil.

1. d4 ... Nf6
2. Bg5
Common continuations are:
  • ... Ne4, Bf4
  • ... c5
  • ... e6, e4
  • ... d5
These positions can also be reached from the move order:
1. d4 ... d5
2. Bg5
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