1nbkqbQ1/1p6/5p1r/r1ppp1pp/R3PPnP/N1pP2R1/1B4P1/4KBN1 b - - 4 20
FEN state: 1nbkqbQ1/1p6/5p1r/r1ppp1pp/R3PPnP/N1pP2R1/1B4P1/4KBN1 b - - 4 20 ; Best move: a5a4
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at d8, black queen at e8, black bishop at f8 and white queen at g8. Black pawn at b7. Black pawn at f6 and black rook at h6. Black rook at a5, black pawn at c5, black pawn at d5, black pawn at e5, black pawn at g5 and black pawn at h5. White rook at a4, white pawn at e4, white pawn at f4, black knight at g4 and white pawn at h4. White knight at a3, black pawn at c3, white pawn at d3 and white rook at g3. White bishop at b2 and white pawn at g2. White king at e1, white bishop at f1 and white knight at g1. Both players have exhausted their castles. Half move number is 4. Full move number is 20. Black to move.