r1bqkbr1/p1pppp1p/n7/1p1P2pn/P7/2P1P3/1PQBKPPP/RN3BNR w q - 0 9
FEN state: r1bqkbr1/p1pppp1p/n7/1p1P2pn/P7/2P1P3/1PQBKPPP/RN3BNR w q - 0 9 ; Best move: a4b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at c7, black pawn at d7, black pawn at e7, black pawn at f7 and black pawn at h7. Black knight at a6. Black pawn at b5, white pawn at d5, black pawn at g5 and black knight at h5. White pawn at a4. White pawn at c3 and white pawn at e3. White pawn at b2, white queen at c2, white bishop at d2, white king at e2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at a1, white knight at b1, 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 0. Full move number is 9. White to move.