Which move? When did you deviate from the main line?

I deviated at move 9.  In the book, Play the Ponziani, the move suggested is 9. Be3 with the comment, "Robbing the f8 bishop of the c5 square"  The fact is black does not play Bc5 in any of the alternative lines.  I concluded the stated reason for plaing 9. Be3 was questionable.  However, delaying the development of the light squared bishop is reasonable.

I planned on playing 16. Bb3 which would have put pressure on f7, but at the last minute I became concerned with 16... Ng4.  But I had a resource that I did not see until I had moved.  At that point all of my analysis was gone.

Yeah, 16.Bb3 looks stronger, but C-nack didn't mark it as inaccuracy, maybe he thinks it's not that bad.

Oh, move 9, in his post C-nack mentionned the 9.Be3 variation; and didn't give even a !? to 9.Bc4, whilst gave "dubious" note to 7.Qf3.

He is wrong about 7.Qf3.  That move transposes into mainlines often but black has more chances to screw up.

I think C-nack might also be mistaken about me playing Kd1.  That move is sharp, but I wanted to get back to a normal position which would have been impossible if I played Kd1. 

Then the tactics took over and made my analysis complicated.  Leaving pieces en prise always needs lotsof analysis.

The improvements for white are going from -0.20 to 0.00., but absolutely nothing centaur-wise that white can work with. As I said, this opening is a complete bust on ICCF interms of practical chances. Black, even when equipped with an old computer like mine, can easily expect to press for a win when white's only recourse is to try and hold the draw. Now Dave can try to disagree with this in OTB chess, but he would be completely wrong in trying to argue from a centaur standpoint where he has very limited experience compared to mine.

You are correct I have little experience in Centaur chess but I do know that the whole line Expertise played was not the best. But I will have to try and analyze the whole 5. d3 line before I can comment much more.

There was another drawing line for Black that with the help of another player who has a very good computer--we figured out how White can obtain an advantge.  Hope to do the same thing here but it will take time...  

This is a question:  Are there lines in the Marshall Gambit to the Ruy Lopez which end in a even game?  '[forced lines]