Suppose I'm playing in a small, 6-round tournament. I win the first five rounds, which also guarantees at least a share of 1st regardless of the results of the last round. What are the ethics of play in the last round? Say the opponent comes to the board and offers a draw before making a move. He judges he's not likely to beat me, so a draw is a good result for him. He's of the opinion that since the result doesn't matter to me, I might as well accept. Should I accept? What if the opponent plays a few moves, and offers a draw in a position I assess as better for me, but still has a lot of play left in it? What if the opponent offers a draw in a position in which he is dead lost?
If I take the draw, I insulate myself from a potential blunder. I also guarantee I win the tournament, not just share first. However by not beating my opponent, I give him an undeserved half-point and more prize money, and it's not fair for my opponents in the first five rounds who had to play me when I was incentivized to win.
Is there some kind of convention for this kind of situation?