r2qkb1r/p3p1p1/n1pp1n1p/1p6/Q1b3P1/2N4P/PP1PPP2/R1B1K1RB b Qkq - 0 15
FEN state: r2qkb1r/p3p1p1/n1pp1n1p/1p6/Q1b3P1/2N4P/PP1PPP2/R1B1K1RB b Qkq - 0 15 ; Best move: b5a4
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at e7 and black pawn at g7. Black knight at a6, black pawn at c6, black pawn at d6, black knight at f6 and black pawn at h6. Black pawn at b5. White queen at a4, black bishop at c4 and white pawn at g4. White knight at c3 and white pawn at h3. White pawn at a2, white pawn at b2, white pawn at d2, white pawn at e2 and white pawn at f2. White rook at a1, white bishop at c1, white king at e1, white rook at g1 and white bishop at h1. White queenside, black kingside and black queenside castles are available. Half move number is 0. Full move number is 15. Black to move.