r1q2kr1/pb1pp1b1/4B3/R1p3pp/4QNn1/1PNPPn2/1PP2PPP/2B2R1K w - - 4 20
FEN state: r1q2kr1/pb1pp1b1/4B3/R1p3pp/4QNn1/1PNPPn2/1PP2PPP/2B2R1K w - - 4 20 ; Best move: f4g6
The current state of the chess board is: Black rook at a8, black queen at c8, black king at f8 and black rook at g8. Black pawn at a7, black bishop at b7, black pawn at d7, black pawn at e7 and black bishop at g7. White bishop at e6. White rook at a5, black pawn at c5, black pawn at g5 and black pawn at h5. White queen at e4, white knight at f4 and black knight at g4. White pawn at b3, white knight at c3, white pawn at d3, white pawn at e3 and black knight at f3. White pawn at b2, white pawn at c2, white pawn at f2, white pawn at g2 and white pawn at h2. White bishop at c1, white rook at f1 and white king at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 20. White to move.