The first time a player plays an opening named after them.
White is +0,-1,=0 (0/1).
Black is +0,-1,=0 (0/1).
I will try to go in alphabetical order, as dictated by Wikipedia article: List of chess openings named after people, but it'll probably get all messed up and I will be too lazy/busy to correct it.
Marshall Attack Capablanca vs Marshall, 1918 (C89) Ruy Lopez, Marshall, 36 moves, 1-0
Anderssen Opening (1.a3) Anderssen vs Morphy, 1858 (A00) Uncommon Opening, 42 moves, 0-1
2 games
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