r2q1bn1/1b1kp3/2n4r/B5p1/Np1PKN1p/PPP5/4PPPP/4RB1R b - - 0 21
FEN state: r2q1bn1/1b1kp3/2n4r/B5p1/Np1PKN1p/PPP5/4PPPP/4RB1R b - - 0 21 ; Best move: c6a5
The current state of the chess board is: Black rook at a8, black queen at d8, black bishop at f8 and black knight at g8. Black bishop at b7, black king at d7 and black pawn at e7. Black knight at c6 and black rook at h6. White bishop at a5 and black pawn at g5. White knight at a4, black pawn at b4, white pawn at d4, white king at e4, white knight at f4 and black pawn at h4. White pawn at a3, white pawn at b3 and white pawn at c3. White pawn at e2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at e1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. Black to move.