r1bq4/pp2rk1p/nn1p4/2p1pPp1/PP1P3P/2P1bQ2/2N2PPR/RN2K3 b Q - 0 21
FEN state: r1bq4/pp2rk1p/nn1p4/2p1pPp1/PP1P3P/2P1bQ2/2N2PPR/RN2K3 b Q - 0 21 ; Best move: e3f4
The current state of the chess board is: Black rook at a8, black bishop at c8 and black queen at d8. Black pawn at a7, black pawn at b7, black rook at e7, black king at f7 and black pawn at h7. Black knight at a6, black knight at b6 and black pawn at d6. Black pawn at c5, black pawn at e5, white pawn at f5 and black pawn at g5. White pawn at a4, white pawn at b4, white pawn at d4 and white pawn at h4. White pawn at c3, black bishop at e3 and white queen at f3. White knight at c2, white pawn at f2, white pawn at g2 and white rook at h2. White rook at a1, white knight at b1 and white king at e1. White queenside is the only castle move available. Half move number is 0. Full move number is 21. Black to move.