Can you show us a move order/diagram?
I haven't really been following Botvinnik Theory lately but from what I last knew about it I thought the Na4 line was the way for white to go for a win while the Rb1 line results in a draw due to 3-move repetition. Not sure if there have been any recent theoretical developments that may challenge that notion.
Recently I went to a tournament and had a chance to play 3 masters. I managed to draw 2 of them, but the last guy was tricky and we went into the botvinnik variation of the semi-slav which is an extremely sharp opening. On move 16 of the mainline white can choose between 16. rb1 and 16. na4. I played 16. rb1 and eventually blundered on move 21, however, on move 21. ne4 white should be able to force a perpetual. Is there anyway for black to play for a win in the rb1 line?
Additionally, in the na4 line I have been unable to find the exact mainlines. Could someone please post them.