r1b3nr/3p1k1p/p5pb/N1p1nPq1/P2p1P2/1PQ2N1B/1B5P/R3K1R1 b Q - 1 21
FEN state: r1b3nr/3p1k1p/p5pb/N1p1nPq1/P2p1P2/1PQ2N1B/1B5P/R3K1R1 b Q - 1 21 ; Best move: g5f4
The current state of the chess board is: Black rook at a8, black bishop at c8, black knight at g8 and black rook at h8. Black pawn at d7, black king at f7 and black pawn at h7. Black pawn at a6, black pawn at g6 and black bishop at h6. White knight at a5, black pawn at c5, black knight at e5, white pawn at f5 and black queen at g5. White pawn at a4, black pawn at d4 and white pawn at f4. White pawn at b3, white queen at c3, white knight at f3 and white bishop at h3. White bishop at b2 and white pawn at h2. White rook at a1, white king at e1 and white rook at g1. White queenside is the only castle move available. Half move number is 1. Full move number is 21. Black to move.