rnb1krq1/7n/p1pp1ppp/4p3/2P1P3/BP2NB2/P2P1PPP/R2Q1KNR w q - 0 20
FEN state: rnb1krq1/7n/p1pp1ppp/4p3/2P1P3/BP2NB2/P2P1PPP/R2Q1KNR w q - 0 20 ; Best move: a3d6
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8, black rook at f8 and black queen at g8. Black knight at h7. Black pawn at a6, black pawn at c6, black pawn at d6, black pawn at f6, black pawn at g6 and black pawn at h6. Black pawn at e5. White pawn at c4 and white pawn at e4. White bishop at a3, white pawn at b3, white knight at e3 and white bishop at f3. White pawn at a2, white pawn at d2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at a1, white queen at d1, white king at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 20. White to move.