r2qkbr1/2pb2pp/pp1Npn2/4B3/3PP3/1P1Q1P2/P1P1K1PP/2R2BNR b q - 3 18
FEN state: r2qkbr1/2pb2pp/pp1Npn2/4B3/3PP3/1P1Q1P2/P1P1K1PP/2R2BNR b q - 3 18 ; Best move: c7d6
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at c7, black bishop at d7, black pawn at g7 and black pawn at h7. Black pawn at a6, black pawn at b6, white knight at d6, black pawn at e6 and black knight at f6. White bishop at e5. White pawn at d4 and white pawn at e4. White pawn at b3, white queen at d3 and white pawn at f3. White pawn at a2, white pawn at c2, white king at e2, white pawn at g2 and white pawn at h2. White rook 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 18. Black to move.