rnbr2k1/1pp2pp1/4pn2/pq3P1p/1N4PP/b2p3B/1PPPPR2/1RBQK1N1 b - - 4 21
FEN state: rnbr2k1/1pp2pp1/4pn2/pq3P1p/1N4PP/b2p3B/1PPPPR2/1RBQK1N1 b - - 4 21 ; Best move: a3b4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black rook at d8 and black king at g8. Black pawn at b7, black pawn at c7, black pawn at f7 and black pawn at g7. Black pawn at e6 and black knight at f6. Black pawn at a5, black queen at b5, white pawn at f5 and black pawn at h5. White knight at b4, white pawn at g4 and white pawn at h4. Black bishop at a3, black pawn at d3 and white bishop at h3. White pawn at b2, white pawn at c2, white pawn at d2, white pawn at e2 and white rook at f2. White rook at b1, white bishop at c1, white queen at d1, white king at e1 and white knight at g1. Both players have exhausted their castles. Half move number is 4. Full move number is 21. Black to move.