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The Queen's Gambit is one of the oldest openings in chess. Its earliest record comes from the Gottingen manuscript, written circa 1490. Later, masters Alessandro Salvio and Gioachino Greco analyzed the opening in the first part of the 17th century. However, it wasn't until the 1890s that masters started including 1.d4 in their repertoire.

d4 d5
c4
Queen’s Gambit

d4 d5
c4 c6
Queens Gambit (Slav Defense)

d4 d5
c4 e6
Queen’s Gambit Declined

d4 d5
c4 dxc4
Queen’s Gambit Accepted

d4 d5
c4 c6
Queen’s Gambit (Slav Defense)

d4 d5
c4 e5
Queen’s Gambit (Albin Countergambit)
Fill in the missing move for the Queens Gambit