r1b1kb1r/1p3p2/p1qp1n1p/2p4n/1P1P1P1P/P1N2N2/2P1P3/R1QK1B1R b kq - 2 20
FEN state: r1b1kb1r/1p3p2/p1qp1n1p/2p4n/1P1P1P1P/P1N2N2/2P1P3/R1QK1B1R b kq - 2 20 ; Best move: c5d4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at b7 and black pawn at f7. Black pawn at a6, black queen at c6, black pawn at d6, black knight at f6 and black pawn at h6. Black pawn at c5 and black knight at h5. White pawn at b4, white pawn at d4, white pawn at f4 and white pawn at h4. White pawn at a3, white knight at c3 and white knight at f3. White pawn at c2 and white pawn at e2. White rook at a1, white queen at c1, white king at d1, white bishop at f1 and white rook at h1. Black kingside and black queenside castles are available. Half move number is 2. Full move number is 20. Black to move.