rn1k1b1r/pppBpn1p/P5q1/3p4/1B1P1Np1/1PP5/R3PP1P/3QKbNR b K - 1 20
FEN state: rn1k1b1r/pppBpn1p/P5q1/3p4/1B1P1Np1/1PP5/R3PP1P/3QKbNR b K - 1 20 ; Best move: b8a6
The current state of the chess board is: Black rook at a8, black knight at b8, black king at d8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at b7, black pawn at c7, white bishop at d7, black pawn at e7, black knight at f7 and black pawn at h7. White pawn at a6 and black queen at g6. Black pawn at d5. White bishop at b4, white pawn at d4, white knight at f4 and black pawn at g4. White pawn at b3 and white pawn at c3. White rook at a2, white pawn at e2, white pawn at f2 and white pawn at h2. White queen at d1, white king at e1, black bishop at f1, white knight at g1 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.