Chess puzzle (Advantage)
Opening: Nimzo-Indian_Defense, Nimzo-Indian_Defense_Three_Knights_Variation
Moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. Bg5 d5 *
Position (FEN): rnbqk2r/p1p2ppp/1p2pn2/3p2B1/1bPP4/2N2N2/PP2PPPP/R2QKB1R w KQkq - 0 6
White to move.
Themes:  Middlegame  
Puzzle rating: 1414
Best move: Qa4+