r4b1r/3nkppn/p1pp4/P3q3/1pbp1P1p/BPP2N2/1R1NP1PP/4KB1R b K - 1 20
FEN state: r4b1r/3nkppn/p1pp4/P3q3/1pbp1P1p/BPP2N2/1R1NP1PP/4KB1R b K - 1 20 ; Best move: b4a3
The current state of the chess board is: Black rook at a8, black bishop at f8 and black rook at h8. Black knight at d7, black king at e7, black pawn at f7, black pawn at g7 and black knight at h7. Black pawn at a6, black pawn at c6 and black pawn at d6. White pawn at a5 and black queen at e5. Black pawn at b4, black bishop at c4, black pawn at d4, white pawn at f4 and black pawn at h4. White bishop at a3, white pawn at b3, white pawn at c3 and white knight at f3. White rook at b2, white knight at d2, white pawn at e2, white pawn at g2 and white pawn at h2. 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 1. Full move number is 20. Black to move.