r1bqk1nr/2pp1pbp/1pn1p3/p5p1/1P1P2P1/2P4B/P2KPP1P/RNBQN2R b k - 0 9
FEN state: r1bqk1nr/2pp1pbp/1pn1p3/p5p1/1P1P2P1/2P4B/P2KPP1P/RNBQN2R b k - 0 9 ; Best move: a5b4
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 knight at g8 and black rook at h8. Black pawn at c7, black pawn at d7, black pawn at f7, black bishop at g7 and black pawn at h7. Black pawn at b6, black knight at c6 and black pawn at e6. Black pawn at a5 and black pawn at g5. White pawn at b4, white pawn at d4 and white pawn at g4. White pawn at c3 and white bishop at h3. White pawn at a2, white king at d2, white pawn at e2, white pawn at f2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1, white queen at d1, white knight at e1 and white rook at h1. Black kingside is the only castle move available. Half move number is 0. Full move number is 9. Black to move.