1nbq2nr/rpppk1pp/4p3/p1b4P/P4pP1/N1PP1N1R/1P2PPB1/R1BQK3 w Q - 5 13
FEN state: 1nbq2nr/rpppk1pp/4p3/p1b4P/P4pP1/N1PP1N1R/1P2PPB1/R1BQK3 w Q - 5 13 ; Best move: a3b5
The current state of the chess board is: Black knight at b8, black bishop at c8, black queen at d8, black knight at g8 and black rook at h8. Black rook at a7, black pawn at b7, black pawn at c7, black pawn at d7, black king at e7, black pawn at g7 and black pawn at h7. Black pawn at e6. Black pawn at a5, black bishop at c5 and white pawn at h5. White pawn at a4, black pawn at f4 and white pawn at g4. White knight at a3, white pawn at c3, white pawn at d3, white knight at f3 and white rook at h3. White pawn at b2, white pawn at e2, white pawn at f2 and white bishop at g2. White rook at a1, white bishop at c1, white queen at d1 and white king at e1. White queenside is the only castle move available. Half move number is 5. Full move number is 13. White to move.