r1b1k1n1/Q1ppq1pr/1p3p2/6Bp/2PpN3/b3PPK1/PP4PP/R4BNR w q - 0 13
FEN state: r1b1k1n1/Q1ppq1pr/1p3p2/6Bp/2PpN3/b3PPK1/PP4PP/R4BNR w q - 0 13 ; Best move: a7a8
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black knight at g8. White queen at a7, black pawn at c7, black pawn at d7, black queen at e7, black pawn at g7 and black rook at h7. Black pawn at b6 and black pawn at f6. White bishop at g5 and black pawn at h5. White pawn at c4, black pawn at d4 and white knight at e4. Black bishop at a3, white pawn at e3, white pawn at f3 and white king at g3. White pawn at a2, white pawn at b2, white pawn at g2 and white pawn at h2. White rook at a1, 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 0. Full move number is 13. White to move.