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c5
1.e4 c5
https://m.stacker.news/57869
d4
1.e4 c5 2.d4
https://m.stacker.news/57871
cxd4
1.e4 c5 2.d4 cxd4
https://m.stacker.news/57875
Qxd4
1.e4 c5 2.d4 cxd4 3.Qxd4
https://m.stacker.news/57876
nc6
c5