1nb1kb2/1r1p1p1r/2q3pp/p1pnp3/NQ1P1P2/B3N3/P1P1PKPP/1R3B1R b - - 6 20
FEN state: 1nb1kb2/1r1p1p1r/2q3pp/p1pnp3/NQ1P1P2/B3N3/P1P1PKPP/1R3B1R b - - 6 20 ; Best move: a5b4
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at e8 and black bishop at f8. Black rook at b7, black pawn at d7, black pawn at f7 and black rook at h7. Black queen at c6, black pawn at g6 and black pawn at h6. Black pawn at a5, black pawn at c5, black knight at d5 and black pawn at e5. White knight at a4, white queen at b4, white pawn at d4 and white pawn at f4. White bishop at a3 and white knight at e3. White pawn at a2, white pawn at c2, white pawn at e2, white king at f2, white pawn at g2 and white pawn at h2. White rook at b1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 6. Full move number is 20. Black to move.