Chess puzzle (Advantage)
Opening: Nimzo-Indian_Defense, Nimzo-Indian_Defense_Three_Knights_Variation
Moves: 1. c4 e6 2. d4 Nf6 3. Nc3 Bb4 4. Nf3 h6 5. a3 Ba5 *
Position (FEN): rnbqk2r/pppp1pp1/4pn1p/b7/2PP4/P1N2N2/1P2PPPP/R1BQKB1R w KQkq - 1 6
White to move.
Themes:  Opening  
Puzzle rating: 1484
Best move: b4