rn2kb1r/p3q3/pB6/3N1pp1/P1p1Pp1p/1PNn4/2P2PPP/R4K1R b q - 3 20
FEN state: rn2kb1r/p3q3/pB6/3N1pp1/P1p1Pp1p/1PNn4/2P2PPP/R4K1R b q - 3 20 ; Best move: a7b6
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 a7 and black queen at e7. Black pawn at a6 and white bishop at b6. White knight at d5, black pawn at f5 and black pawn at g5. White pawn at a4, black pawn at c4, white pawn at e4, black pawn at f4 and black pawn at h4. White pawn at b3, white knight at c3 and black knight at d3. White pawn at c2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at a1, white king at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 3. Full move number is 20. Black to move.