r3kb1r/1p1q1pp1/2n1p2n/p1p1P2p/2P2P1P/3Q4/PR1PB1P1/2BK2NR b kq - 2 21
FEN state: r3kb1r/1p1q1pp1/2n1p2n/p1p1P2p/2P2P1P/3Q4/PR1PB1P1/2BK2NR b kq - 2 21 ; Best move: c6d4
The current state of the chess board is: Black rook at a8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at b7, black queen at d7, black pawn at f7 and black pawn at g7. Black knight at c6, black pawn at e6 and black knight at h6. Black pawn at a5, black pawn at c5, white pawn at e5 and black pawn at h5. White pawn at c4, white pawn at f4 and white pawn at h4. White queen at d3. White pawn at a2, white rook at b2, white pawn at d2, white bishop at e2 and white pawn at g2. White bishop at c1, white king at d1, white knight at g1 and white rook at h1. Black kingside and black queenside castles are available. Half move number is 2. Full move number is 21. Black to move.