1rb1k2r/1p1p3p/2p2np1/p2n1p2/P1P1pb1P/1P2P1P1/RB1P2q1/1N1QKB2 b k - 1 21
FEN state: 1rb1k2r/1p1p3p/2p2np1/p2n1p2/P1P1pb1P/1P2P1P1/RB1P2q1/1N1QKB2 b k - 1 21 ; Best move: f4g3
The current state of the chess board is: Black rook at b8, black bishop at c8, black king at e8 and black rook at h8. Black pawn at b7, black pawn at d7 and black pawn at h7. Black pawn at c6, black knight at f6 and black pawn at g6. Black pawn at a5, black knight at d5 and black pawn at f5. White pawn at a4, white pawn at c4, black pawn at e4, black bishop at f4 and white pawn at h4. White pawn at b3, white pawn at e3 and white pawn at g3. White rook at a2, white bishop at b2, white pawn at d2 and black queen at g2. White knight at b1, white queen at d1, white king at e1 and white bishop at f1. Black kingside is the only castle move available. Half move number is 1. Full move number is 21. Black to move.