Chess puzzle (Advantage)
Opening: Nimzo-Indian_Defense, Nimzo-Indian_Defense_Three_Knights_Variation
Moves: 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb4 5. Qc2 Ba6 6. e3 d5 *
Position (FEN): rn1qk2r/p1p2ppp/bp2pn2/3p4/1bPP4/2N1PN2/PPQ2PPP/R1B1KB1R w KQkq - 0 7
White to move.
Themes:  Opening  
Puzzle rating: 1189
Best move: Qa4+