1nb1kb1r/r2p3n/p1p5/qp2pppp/QP4P1/N2KP2B/P1PP1P1P/R1B3NR b k - 2 13
FEN state: 1nb1kb1r/r2p3n/p1p5/qp2pppp/QP4P1/N2KP2B/P1PP1P1P/R1B3NR b k - 2 13 ; Best move: a5a4
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. Black rook at a7, black pawn at d7 and black knight at h7. Black pawn at a6 and black pawn at c6. Black queen at a5, black pawn at b5, black pawn at e5, black pawn at f5, black pawn at g5 and black pawn at h5. White queen at a4, white pawn at b4 and white pawn at g4. White knight at a3, white king at d3, white pawn at e3 and white bishop at h3. White pawn at a2, white pawn at c2, white pawn at d2, white pawn at f2 and white pawn at h2. White rook at a1, white bishop at c1, white knight at g1 and white rook at h1. Black kingside is the only castle move available. Half move number is 2. Full move number is 13. Black to move.