I just got rocked by Steliokontos, a Master League Protoss player, on Backwater Gulch. This map was added as part of the Patch 1.3 map pack. It is actually quite nice. The rush distance is not too large and the natural expansions are flanked by destructible rocks. This forces early pushes to come from one ramp while opening up expansions to later attacks via the destructible rock ramps.
This match I tried to execute a terribly timed 4 Gate without really thinking that this map spawns players in a location with only one small entrance. As a result of the small entrance and my poor execution, the 4 Gate failed to do any damage and allowed Steliokontos to tech due to early Force Fields. Upon reviewing the replay, I noticed that the build order that Steliokontos implemented was actually really well timed. It gives you a sentry early to make up for the lack of units and shoots out a colossus within a reasonable time (9 minutes). I jotted down the build order to try to implement it in my own matches.
Build order after the jump.
Here is his build order:
Boost Probes on 10
16 Pylon (Cut probe production)
16 Cybernetics Core (Continue probe production)
Gateway Tech as soon as Core is complete and boost it until completion
21 Sentry and boost it
29 Robotics Facility
30 Warp 2 Stalkers
36 Observer and boost it (Cut probe production)
36 Robotics Bay
42 Colossus and boost
From here you can continue to boost out Colossus and think about expanding and continuing probe production. Your choice really depends on the map, the opposing player's build, and your style of play I think.
Here is the replay where I got beat - replay download link.