rn2kb1r/3p1pp1/bnp4p/1q2p3/PppPPB2/5PP1/NK5P/1R1Q1BNR b q - 1 20
FEN state: rn2kb1r/3p1pp1/bnp4p/1q2p3/PppPPB2/5PP1/NK5P/1R1Q1BNR b q - 1 20 ; Best move: b6a4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at d7, black pawn at f7 and black pawn at g7. Black bishop at a6, black knight at b6, black pawn at c6 and black pawn at h6. Black queen at b5 and black pawn at e5. White pawn at a4, black pawn at b4, black pawn at c4, white pawn at d4, white pawn at e4 and white bishop at f4. White pawn at f3 and white pawn at g3. White knight at a2, white king at b2 and white pawn at h2. White rook at b1, white queen at d1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 20. Black to move.