Kelly:
But now that you've mentioned Behr's "line of Charm" in relation to Riviera's #10, and now that I know what you really mean is the "line of instinct", let's look to see how the "line of instinct" works on Riv's #10!
As you said, the "line of instinct" from the tee on Riv's #10 is to hit the tee shot right at the green. Did Thomas remove that "line of instinct" right at the green as an option by placing a bunker or obstacle feature on it? Not at all. If you look at the photos above it looks almost like a straight fairway corridor right at the green (line of instinct). How inviting does that look to a player from the tee who may not be that aware of all the endless nuances of that hole? Pretty inviting and tempting, I'd say.
But the truth is, as Jeff F has said (and with his lines and colored dots as the places to drive the ball or not) above and every player and long player (like Davis Love) who knows that hole well knows, if a long ball hitter strays even a yard right of about the direct line from the tee to the left side of that right greenside bunker (which definitely looks like the ideal "line of Instinct") basically you're dead, particularly if the pin is in the back.
So Thomas didn't actually take the "line of instinct" away from the player by placing an obstacle feature on it he merely took away everything even a yard right of that line of instinct from the player as a possible second shot option! How cool and sophisticated a "line of instinct" (lines of charm) use is that?
Lynn:
That's very interesting the green may actually slope slightly from front to back. I did not know that at all! The reason I know that hole so well is one morning starting very early (day break) I walked that course but since seeing Riviera's #10 is really why I went west, I did spend over an hour that morning looking at everything about that hole from every angle, measuring everything etc. But I didn't pick up on that slight front to back tilt on the green, though, and now the other thing I don't really remember is----does the front of the green slope right to left as much as the back---or more or less? For some reason I can't remember that part.
Lynn, the other thing about Riviera that I've said on here many times that really did strike me, is how despite the golf course being within that canyon which anyone can see is pretty confining and even despite the fact that the course probably has too many trees (far more than in Thomas's time) it just doesn't feel confined for some odd reason when you on any hole. How or why can that be? But it is!
Frankly, the thing I really took away from that trip to SoCal is the unbelievable uniqueness of what one might term "Canyon Golf" in Southern California. I sure never saw anything like it before or since.