r1q1kb1r/1p2ppp1/p1n3p1/2p2n2/N1PpP3/P4P2/1P1PK1BP/R1B3NR b q - 8 20
FEN state: r1q1kb1r/1p2ppp1/p1n3p1/2p2n2/N1PpP3/P4P2/1P1PK1BP/R1B3NR b q - 8 20 ; Best move: d4d3
The current state of the chess board is: Black rook at a8, black queen at c8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at b7, black pawn at e7, black pawn at f7 and black pawn at g7. Black pawn at a6, black knight at c6 and black pawn at g6. Black pawn at c5 and black knight at f5. White knight at a4, white pawn at c4, black pawn at d4 and white pawn at e4. White pawn at a3 and white pawn at f3. White pawn at b2, white pawn at d2, white king at e2, white bishop at g2 and white pawn at h2. White rook at a1, white bishop at c1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 8. Full move number is 20. Black to move.