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The Queen’s Gambit Declined is one of the most popular responses by black to 1.d4, and is characterised by 1.d4 d5 2.c4 e6

Videos:

• Queen’s Gambit Declined – an introduction

VIdeos: Games

• van Wely vs Short, Corus 2010, Part 1
• van Wely vs Short, Corus 2010, Part 2

Other resources:

• Wikipedia – Queen’s Gambit Declined
• Chessgames.com – Queen’s Gambit Declined
• Wikibooks – Queen’s Gambit Declined