r1b1kb1r/n1pqp2p/p3p1p1/1p1pP3/N2P1B1P/1P4P1/P1Q2Pn1/1R1K1B1R b kq - 0 18
FEN state: r1b1kb1r/n1pqp2p/p3p1p1/1p1pP3/N2P1B1P/1P4P1/P1Q2Pn1/1R1K1B1R b kq - 0 18 ; Best move: b5a4
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 knight at a7, black pawn at c7, black queen at d7, black pawn at e7 and black pawn at h7. Black pawn at a6, black pawn at e6 and black pawn at g6. Black pawn at b5, black pawn at d5 and white pawn at e5. White knight at a4, white pawn at d4, white bishop at f4 and white pawn at h4. White pawn at b3 and white pawn at g3. White pawn at a2, white queen at c2, white pawn at f2 and black knight at g2. White rook at b1, 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 0. Full move number is 18. Black to move.