r2qk1r1/p1p4n/1p1ppnp1/P5bp/RQ3p1B/1P1PPP2/1NP1B1PP/4K1NR b Kq - 2 21
FEN state: r2qk1r1/p1p4n/1p1ppnp1/P5bp/RQ3p1B/1P1PPP2/1NP1B1PP/4K1NR b Kq - 2 21 ; Best move: g5h4
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8 and black rook at g8. Black pawn at a7, black pawn at c7 and black knight at h7. Black pawn at b6, black pawn at d6, black pawn at e6, black knight at f6 and black pawn at g6. White pawn at a5, black bishop at g5 and black pawn at h5. White rook at a4, white queen at b4, black pawn at f4 and white bishop at h4. White pawn at b3, white pawn at d3, white pawn at e3 and white pawn at f3. White knight at b2, white pawn at c2, white bishop at e2, white pawn at g2 and white pawn at h2. White king at e1, white knight at g1 and white rook at h1. White kingside and black queenside castles are available. Half move number is 2. Full move number is 21. Black to move.