2bqk1nr/1ppp4/2n4p/5p2/pr1p2pP/P1P1PNP1/1P3P2/RNb1KBR1 w Q - 0 20
FEN state: 2bqk1nr/1ppp4/2n4p/5p2/pr1p2pP/P1P1PNP1/1P3P2/RNb1KBR1 w Q - 0 20 ; Best move: a3b4
The current state of the chess board is: Black bishop at c8, black queen at d8, black king at e8, black knight at g8 and black rook at h8. Black pawn at b7, black pawn at c7 and black pawn at d7. Black knight at c6 and black pawn at h6. Black pawn at f5. Black pawn at a4, black rook at b4, black pawn at d4, black pawn at g4 and white pawn at h4. White pawn at a3, white pawn at c3, white pawn at e3, white knight at f3 and white pawn at g3. White pawn at b2 and white pawn at f2. White rook at a1, white knight at b1, black bishop at c1, white king at e1, white bishop at f1 and white rook at g1. White queenside is the only castle move available. Half move number is 0. Full move number is 20. White to move.