r2nkbnr/p5p1/b1N1p2B/qp2pp1p/1PpP3P/2P2P2/2Q1B1P1/1R3KNR b k - 1 20
FEN state: r2nkbnr/p5p1/b1N1p2B/qp2pp1p/1PpP3P/2P2P2/2Q1B1P1/1R3KNR b k - 1 20 ; Best move: a5b6
The current state of the chess board is: Black rook at a8, black knight at d8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at a7 and black pawn at g7. Black bishop at a6, white knight at c6, black pawn at e6 and white bishop at h6. Black queen at a5, black pawn at b5, black pawn at e5, black pawn at f5 and black pawn at h5. White pawn at b4, black pawn at c4, white pawn at d4 and white pawn at h4. White pawn at c3 and white pawn at f3. White queen at c2, white bishop at e2 and white pawn at g2. White rook at b1, white king at f1, white knight at g1 and white rook at h1. Black kingside is the only castle move available. Half move number is 1. Full move number is 20. Black to move.