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The only way I can think of to eliminate this is to play all games on Explored. This in turn eliminates the importance of scouting, which is a huge skill differentiator, even on pro level.
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If this Showmatch is gonna be a success, maybe the same map can be played again, hence players would know the map beforehand and can prepare "the optimal scouting route".
so would that be what u want? (i actually like the idea to have one standard map, thats always the same)