Heres crunchers response to that game:
"My plan on Crevasse was to mix my build up. First two game I decided to forge fast expo, into collosus/voidray. I expected him to think I would be planning the same kind of build. When he scouted me I tried to fake a 4gate, since I beat him on ladder just a few hours before our match with that strategy. I also went fast hallcuination to get scouting out, to check if he over-reacted to what he saw. I saw no units and after I scouted him, I decided to pressure. I did not plan on winning the game with that push, but he had ZERO units, so I just ended the game."
By fake a 4gate I guess all he means is go stalker first instead of sentry.
Cruncher did not have that many units really, but idra had basically none.