I play a course with subtly undulating greens that I find almost impossible to read. I was hitting the ball great yesterday but shot a 91 partly because I three putted eight or nine times and never made a birdy putt of course.

What makes it even more frustrating is that I have a good putting stroke but I just can't read the line, although my pace is not too bad. On more than one occassion I completely mis-read the borrow, thinking the putt would break from the right only to find it breaking even further away to the left.

The course itself is also very undulating (you rarely get a flat lie) so there are few horizontal surfaces to use as a reference point when you're on the green.

Does anyone have any good tips on how to read greens? This could make a huge difference to my scores.