diff --git a/sources/tech/20170312 OpenGL  Go Tutorial Part 2: Drawing the Game Board.md b/sources/tech/20170312 OpenGL  Go Tutorial Part 2 Drawing the Game Board.md
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rename from sources/tech/20170312 OpenGL  Go Tutorial Part 2: Drawing the Game Board.md
rename to sources/tech/20170312 OpenGL  Go Tutorial Part 2 Drawing the Game Board.md