rnb1kb1r/1ppp2p1/pQ1q3p/3npp2/1P2PP2/N1PPR3/P1K3PP/5BNR w q - 2 20
FEN state: rnb1kb1r/1ppp2p1/pQ1q3p/3npp2/1P2PP2/N1PPR3/P1K3PP/5BNR w q - 2 20 ; Best move: e4d5
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 bishop at f8 and black rook at h8. Black pawn at b7, black pawn at c7, black pawn at d7 and black pawn at g7. Black pawn at a6, white queen at b6, black queen at d6 and black pawn at h6. Black knight at d5, black pawn at e5 and black pawn at f5. White pawn at b4, white pawn at e4 and white pawn at f4. White knight at a3, white pawn at c3, white pawn at d3 and white rook at e3. White pawn at a2, white king at c2, white pawn at g2 and white pawn at h2. White bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 2. Full move number is 20. White to move.