r1q1kb1r/3np3/2bp1p1p/ppp3n1/PPPP2P1/RKQ1P2p/5P2/1NB2BNR b q - 3 21
FEN state: r1q1kb1r/3np3/2bp1p1p/ppp3n1/PPPP2P1/RKQ1P2p/5P2/1NB2BNR b q - 3 21 ; Best move: c6h1
The current state of the chess board is: Black rook at a8, black queen at c8, black king at e8, black bishop at f8 and black rook at h8. Black knight at d7 and black pawn at e7. Black bishop at c6, black pawn at d6, black pawn at f6 and black pawn at h6. Black pawn at a5, black pawn at b5, black pawn at c5 and black knight at g5. White pawn at a4, white pawn at b4, white pawn at c4, white pawn at d4 and white pawn at g4. White rook at a3, white king at b3, white queen at c3, white pawn at e3 and black pawn at h3. White pawn at f2. White knight at b1, white bishop at c1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 3. Full move number is 21. Black to move.