Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Nyezhmetdinov-Rossolimo_Attack
Moves: 1. e4 c5 2. Nf3 Nc6 3. Bb5 Qb6 4. Nc3 e6 5. O-O Be7 6. d4 *
Position (FEN): r1b1k1nr/pp1pbppp/1qn1p3/1Bp5/3PP3/2N2N2/PPP2PPP/R1BQ1RK1 b kq - 0 6
Black to move.
Themes:  Opening  
Puzzle rating: 1019
Best move: cxd4