r4r1k/pn1p1p1p/b1n2b1q/2pBp3/Np4P1/PP1P3P/2P1PPR1/R1BQK1N1 b Q - 10 21
FEN state: r4r1k/pn1p1p1p/b1n2b1q/2pBp3/Np4P1/PP1P3P/2P1PPR1/R1BQK1N1 b Q - 10 21 ; Best move: h6g7
The current state of the chess board is: Black rook at a8, black rook at f8 and black king at h8. Black pawn at a7, black knight at b7, black pawn at d7, black pawn at f7 and black pawn at h7. Black bishop at a6, black knight at c6, black bishop at f6 and black queen at h6. Black pawn at c5, white bishop at d5 and black pawn at e5. White knight at a4, black pawn at b4 and white pawn at g4. White pawn at a3, white pawn at b3, white pawn at d3 and white pawn at h3. White pawn at c2, white pawn at e2, white pawn at f2 and white rook at g2. White rook at a1, white bishop at c1, white queen at d1, white king at e1 and white knight at g1. White queenside is the only castle move available. Half move number is 10. Full move number is 21. Black to move.