rn1q1b1r/pk2n1p1/b2p1p2/6Np/1p3PB1/N3P3/PPPP2PP/1RBQKR2 b - - 4 13
FEN state: rn1q1b1r/pk2n1p1/b2p1p2/6Np/1p3PB1/N3P3/PPPP2PP/1RBQKR2 b - - 4 13 ; Best move: f6g5
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at d8, black bishop at f8 and black rook at h8. Black pawn at a7, black king at b7, black knight at e7 and black pawn at g7. Black bishop at a6, black pawn at d6 and black pawn at f6. White knight at g5 and black pawn at h5. Black pawn at b4, white pawn at f4 and white bishop at g4. White knight at a3 and white pawn at e3. White pawn at a2, white pawn at b2, white pawn at c2, white pawn at d2, white pawn at g2 and white pawn at h2. White rook at b1, white bishop at c1, white queen at d1, white king at e1 and white rook at f1. Both players have exhausted their castles. Half move number is 4. Full move number is 13. Black to move.