r1bqk2r/p1p4p/n2pp3/1P3p2/PP4nP/3PP1bN/R2N1P1R/2B1KB2 b kq - 0 13
FEN state: r1bqk2r/p1p4p/n2pp3/1P3p2/PP4nP/3PP1bN/R2N1P1R/2B1KB2 b kq - 0 13 ; Best move: a6b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8 and black rook at h8. Black pawn at a7, black pawn at c7 and black pawn at h7. Black knight at a6, black pawn at d6 and black pawn at e6. White pawn at b5 and black pawn at f5. White pawn at a4, white pawn at b4, black knight at g4 and white pawn at h4. White pawn at d3, white pawn at e3, black bishop at g3 and white knight at h3. White rook at a2, white knight at d2, white pawn at f2 and white rook at h2. White bishop at c1, white king at e1 and white bishop at f1. Black kingside and black queenside castles are available. Half move number is 0. Full move number is 13. Black to move.