rnbq1b1r/1p1p1kp1/5n2/P3p3/P1p3B1/BR2Pp2/2PPNP1P/1N1Q1RK1 b - - 4 20
FEN state: rnbq1b1r/1p1p1kp1/5n2/P3p3/P1p3B1/BR2Pp2/2PPNP1P/1N1Q1RK1 b - - 4 20 ; Best move: f6g4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black queen at d8, black bishop at f8 and black rook at h8. Black pawn at b7, black pawn at d7, black king at f7 and black pawn at g7. Black knight at f6. White pawn at a5 and black pawn at e5. White pawn at a4, black pawn at c4 and white bishop at g4. White bishop at a3, white rook at b3, white pawn at e3 and black pawn at f3. White pawn at c2, white pawn at d2, white knight at e2, white pawn at f2 and white pawn at h2. White knight at b1, white queen at d1, white rook at f1 and white king at g1. Both players have exhausted their castles. Half move number is 4. Full move number is 20. Black to move.