rq2k2r/pbp2pp1/6n1/2bpp2P/p1P1P3/2RP3P/nP3PBN/1QBK2NR b q - 2 21
FEN state: rq2k2r/pbp2pp1/6n1/2bpp2P/p1P1P3/2RP3P/nP3PBN/1QBK2NR b q - 2 21 ; Best move: a2c3
The current state of the chess board is: Black rook at a8, black queen at b8, black king at e8 and black rook at h8. Black pawn at a7, black bishop at b7, black pawn at c7, black pawn at f7 and black pawn at g7. Black knight at g6. Black bishop at c5, black pawn at d5, black pawn at e5 and white pawn at h5. Black pawn at a4, white pawn at c4 and white pawn at e4. White rook at c3, white pawn at d3 and white pawn at h3. Black knight at a2, white pawn at b2, white pawn at f2, white bishop at g2 and white knight at h2. White queen at b1, white bishop at c1, white king at d1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 2. Full move number is 21. Black to move.