r2q1Nr1/2n2kp1/1pppbp2/p6p/P6N/1P1P4/1nP1P1PP/2RQKB1R b K - 0 20
FEN state: r2q1Nr1/2n2kp1/1pppbp2/p6p/P6N/1P1P4/1nP1P1PP/2RQKB1R b K - 0 20 ; Best move: b2d1
The current state of the chess board is: Black rook at a8, black queen at d8, white knight at f8 and black rook at g8. Black knight at c7, black king at f7 and black pawn at g7. Black pawn at b6, black pawn at c6, black pawn at d6, black bishop at e6 and black pawn at f6. Black pawn at a5 and black pawn at h5. White pawn at a4 and white knight at h4. White pawn at b3 and white pawn at d3. Black knight at b2, white pawn at c2, white pawn at e2, white pawn at g2 and white pawn at h2. White rook at c1, white queen at d1, white king at e1, white bishop at f1 and white rook at h1. White kingside is the only castle move available. Half move number is 0. Full move number is 20. Black to move.