r2qkbr1/pbppp1p1/6np/1p3N1P/2Pn1PP1/1P2K3/P3P3/R1BQ1B1R b - - 2 20
FEN state: r2qkbr1/pbppp1p1/6np/1p3N1P/2Pn1PP1/1P2K3/P3P3/R1BQ1B1R b - - 2 20 ; Best move: d4f5
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 g8. Black pawn at a7, black bishop at b7, black pawn at c7, black pawn at d7, black pawn at e7 and black pawn at g7. Black knight at g6 and black pawn at h6. Black pawn at b5, white knight at f5 and white pawn at h5. White pawn at c4, black knight at d4, white pawn at f4 and white pawn at g4. White pawn at b3 and white king at e3. White pawn at a2 and white pawn at e2. White rook at a1, white bishop at c1, white queen at d1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 2. Full move number is 20. Black to move.