r1Bk1br1/p5pp/n1p5/1p1np3/Q2q2P1/P1P1P2P/1B1N4/RN2K3 w Q - 0 21
FEN state: r1Bk1br1/p5pp/n1p5/1p1np3/Q2q2P1/P1P1P2P/1B1N4/RN2K3 w Q - 0 21 ; Best move: c3d4
The current state of the chess board is: Black rook at a8, white bishop at c8, black king at d8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at g7 and black pawn at h7. Black knight at a6 and black pawn at c6. Black pawn at b5, black knight at d5 and black pawn at e5. White queen at a4, black queen at d4 and white pawn at g4. White pawn at a3, white pawn at c3, white pawn at e3 and white pawn at h3. White bishop at b2 and white knight at d2. White rook at a1, white knight at b1 and white king at e1. White queenside is the only castle move available. Half move number is 0. Full move number is 21. White to move.