r1bk1bn1/p2q2pr/3pp3/1pp4p/Pn2Pp1P/1R3R2/1PPPBPP1/1NBKQ1N1 b - - 5 15
FEN state: r1bk1bn1/p2q2pr/3pp3/1pp4p/Pn2Pp1P/1R3R2/1PPPBPP1/1NBKQ1N1 b - - 5 15 ; Best move: b5a4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at d8, black bishop at f8 and black knight at g8. Black pawn at a7, black queen at d7, black pawn at g7 and black rook at h7. Black pawn at d6 and black pawn at e6. Black pawn at b5, black pawn at c5 and black pawn at h5. White pawn at a4, black knight at b4, white pawn at e4, black pawn at f4 and white pawn at h4. White rook at b3 and white rook at f3. White pawn at b2, white pawn at c2, white pawn at d2, white bishop at e2, white pawn at f2 and white pawn at g2. White knight at b1, white bishop at c1, white king at d1, white queen at e1 and white knight at g1. Both players have exhausted their castles. Half move number is 5. Full move number is 15. Black to move.