r1b1kb2/pq4pr/1pp1BpPp/2Pp4/1n3P2/PQ6/P2P1K1P/R1B4R w q - 1 21
FEN state: r1b1kb2/pq4pr/1pp1BpPp/2Pp4/1n3P2/PQ6/P2P1K1P/R1B4R w q - 1 21 ; Best move: e6f7
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black bishop at f8. Black pawn at a7, black queen at b7, black pawn at g7 and black rook at h7. Black pawn at b6, black pawn at c6, white bishop at e6, black pawn at f6, white pawn at g6 and black pawn at h6. White pawn at c5 and black pawn at d5. Black knight at b4 and white pawn at f4. White pawn at a3 and white queen at b3. White pawn at a2, white pawn at d2, white king at f2 and white pawn at h2. White rook at a1, white bishop at c1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 21. White to move.