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Nf3
1.d4 d5 2.Bf4 Nf6 3.e3 e6 4.Nf3
https://m.stacker.news/57743
Nc6
1.d4 d5 2.Bf4 Nf6 3.e3 e6 4.Nf3 Nc6
https://m.stacker.news/57744
Nf3