1rb3nr/1p1kppb1/pq4p1/1Npp3p/1n6/P1P2N2/1B1PPPPP/R2QKB1R w Q - 6 13
FEN state: 1rb3nr/1p1kppb1/pq4p1/1Npp3p/1n6/P1P2N2/1B1PPPPP/R2QKB1R w Q - 6 13 ; Best move: a3b4
The current state of the chess board is: Black rook at b8, black bishop at c8, black knight at g8 and black rook at h8. Black pawn at b7, black king at d7, black pawn at e7, black pawn at f7 and black bishop at g7. Black pawn at a6, black queen at b6 and black pawn at g6. White knight at b5, black pawn at c5, black pawn at d5 and black pawn at h5. Black knight at b4. White pawn at a3, white pawn at c3 and white knight at f3. White bishop at b2, white pawn at d2, white pawn at e2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at a1, white queen at d1, 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 6. Full move number is 13. White to move.