He checks the corner of the third base. Is there a 1-pixel gap where a Reaper can jump? Yes. He notes the coordinates. X: 42, Y: 118. He will wall that gap with an Evolution Chamber before the 2:30 mark.
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: Use the "Scan and Repair" tool in the Battle.net Options menu to identify and fix corrupted files. Preparing game data - Technical Support - SC2 Forums He checks the corner of the third base