r1bq1bn1/p1ppkp1r/np4pp/4p3/5P2/N2PP2P/PPP2KP1/R1B1QBNR b - - 1 10
FEN state: r1bq1bn1/p1ppkp1r/np4pp/4p3/5P2/N2PP2P/PPP2KP1/R1B1QBNR b - - 1 10 ; Best move: e5e4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black bishop at f8 and black knight at g8. Black pawn at a7, black pawn at c7, black pawn at d7, black king at e7, black pawn at f7 and black rook at h7. Black knight at a6, black pawn at b6, black pawn at g6 and black pawn at h6. Black pawn at e5. White pawn at f4. White knight at a3, white pawn at d3, white pawn at e3 and white pawn at h3. White pawn at a2, white pawn at b2, white pawn at c2, white king at f2 and white pawn at g2. White rook at a1, white bishop at c1, white queen at e1, white bishop at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 1. Full move number is 10. Black to move.