r4b1r/pbn1p1p1/1q3Bk1/Nppp1p1p/3P2P1/1P2P2N/P1P1QP1P/1R2KB1R w - - 10 20
FEN state: r4b1r/pbn1p1p1/1q3Bk1/Nppp1p1p/3P2P1/1P2P2N/P1P1QP1P/1R2KB1R w - - 10 20 ; Best move: a5b7
The current state of the chess board is: Black rook at a8, black bishop at f8 and black rook at h8. Black pawn at a7, black bishop at b7, black knight at c7, black pawn at e7 and black pawn at g7. Black queen at b6, white bishop at f6 and black king at g6. White knight at a5, black pawn at b5, black pawn at c5, black pawn at d5, black pawn at f5 and black pawn at h5. White pawn at d4 and white pawn at g4. White pawn at b3, white pawn at e3 and white knight at h3. White pawn at a2, white pawn at c2, white queen at e2, white pawn at f2 and white pawn at h2. White rook at b1, white king at e1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 10. Full move number is 20. White to move.