r2k2nr/n1p4p/1p3p1b/pP1pp1p1/q1PPPP2/5B1N/4QBPP/RN2K1R1 w Q - 0 18
FEN state: r2k2nr/n1p4p/1p3p1b/pP1pp1p1/q1PPPP2/5B1N/4QBPP/RN2K1R1 w Q - 0 18 ; Best move: a1a4
The current state of the chess board is: Black rook at a8, black king at d8, black knight at g8 and black rook at h8. Black knight at a7, black pawn at c7 and black pawn at h7. Black pawn at b6, black pawn at f6 and black bishop at h6. Black pawn at a5, white pawn at b5, black pawn at d5, black pawn at e5 and black pawn at g5. Black queen at a4, white pawn at c4, white pawn at d4, white pawn at e4 and white pawn at f4. White bishop at f3 and white knight at h3. White queen at e2, white bishop at f2, white pawn at g2 and white pawn at h2. White rook at a1, white knight at b1, white king at e1 and white rook at g1. White queenside is the only castle move available. Half move number is 0. Full move number is 18. White to move.