rn2k1r1/p1p1bpBp/1p2b3/1N1p4/PPPP1Q1n/8/4KPP1/R4BNR b q - 2 20
FEN state: rn2k1r1/p1p1bpBp/1p2b3/1N1p4/PPPP1Q1n/8/4KPP1/R4BNR b q - 2 20 ; Best move: b8a6
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8 and black rook at g8. Black pawn at a7, black pawn at c7, black bishop at e7, black pawn at f7, white bishop at g7 and black pawn at h7. Black pawn at b6 and black bishop at e6. White knight at b5 and black pawn at d5. White pawn at a4, white pawn at b4, white pawn at c4, white pawn at d4, white queen at f4 and black knight at h4. White king at e2, white pawn at f2 and white pawn at g2. White rook at a1, 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 2. Full move number is 20. Black to move.