r1b1qrk1/2pp1p1p/3b3n/1pnP4/3p2pP/pPP5/PBQ1PPP1/RN2KB1R w Q - 0 16
FEN state: r1b1qrk1/2pp1p1p/3b3n/1pnP4/3p2pP/pPP5/PBQ1PPP1/RN2KB1R w Q - 0 16 ; Best move: b1a3
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at e8, black rook at f8 and black king at g8. Black pawn at c7, black pawn at d7, black pawn at f7 and black pawn at h7. Black bishop at d6 and black knight at h6. Black pawn at b5, black knight at c5 and white pawn at d5. Black pawn at d4, black pawn at g4 and white pawn at h4. Black pawn at a3, white pawn at b3 and white pawn at c3. White pawn at a2, white bishop at b2, white queen at c2, white pawn at e2, white pawn at f2 and white pawn at g2. White rook at a1, white knight at b1, white king at e1, white bishop at f1 and white rook at h1. White queenside is the only castle move available. Half move number is 0. Full move number is 16. White to move.