r2kqbnr/2p1pppp/pp1p4/1P6/P1b2P1P/6P1/2QNP3/RNBK1B1R b - - 0 13
FEN state: r2kqbnr/2p1pppp/pp1p4/1P6/P1b2P1P/6P1/2QNP3/RNBK1B1R b - - 0 13 ; Best move: a6b5
The current state of the chess board is: Black rook at a8, black king at d8, black queen at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at c7, black pawn at e7, black pawn at f7, black pawn at g7 and black pawn at h7. Black pawn at a6, black pawn at b6 and black pawn at d6. White pawn at b5. White pawn at a4, black bishop at c4, white pawn at f4 and white pawn at h4. White pawn at g3. White queen at c2, white knight at d2 and white pawn at e2. White rook at a1, white knight at b1, white bishop at c1, white king at d1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 13. Black to move.