r1b3nr/p1ppb1kp/n2q1p2/1p2ppN1/1P6/NR1BP1P1/P1QP3P/2B1KR2 b - - 12 20
FEN state: r1b3nr/p1ppb1kp/n2q1p2/1p2ppN1/1P6/NR1BP1P1/P1QP3P/2B1KR2 b - - 12 20 ; Best move: a6b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black knight at g8 and black rook at h8. Black pawn at a7, black pawn at c7, black pawn at d7, black bishop at e7, black king at g7 and black pawn at h7. Black knight at a6, black queen at d6 and black pawn at f6. Black pawn at b5, black pawn at e5, black pawn at f5 and white knight at g5. White pawn at b4. White knight at a3, white rook at b3, white bishop at d3, white pawn at e3 and white pawn at g3. White pawn at a2, white queen at c2, white pawn at d2 and white pawn at h2. White bishop at c1, white king at e1 and white rook at f1. Both players have exhausted their castles. Half move number is 12. Full move number is 20. Black to move.