1r2kbr1/4pp1p/pqn1b2n/1p1p2p1/N1Pp4/3PPP2/PP2Q1PP/R1B1KBR1 w Q - 4 13
FEN state: 1r2kbr1/4pp1p/pqn1b2n/1p1p2p1/N1Pp4/3PPP2/PP2Q1PP/R1B1KBR1 w Q - 4 13 ; Best move: a4b6
The current state of the chess board is: Black rook at b8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at e7, black pawn at f7 and black pawn at h7. Black pawn at a6, black queen at b6, black knight at c6, black bishop at e6 and black knight at h6. Black pawn at b5, black pawn at d5 and black pawn at g5. White knight at a4, white pawn at c4 and black pawn at d4. White pawn at d3, white pawn at e3 and white pawn at f3. White pawn at a2, white pawn at b2, white queen at e2, white pawn at g2 and white pawn at h2. White rook at a1, white bishop at c1, white king at e1, white bishop at f1 and white rook at g1. White queenside is the only castle move available. Half move number is 4. Full move number is 13. White to move.