if (window.location.hostname == "chessmind.ai" && !window.location.pathname.startsWith('/embed/')) { document.write('<iframe src="https://www.googletagmanager.com/ns.html?id=GTM-TS8C2C58" height="0" width="0" style="display:none;visibility:hidden"></iframe>'); }

ECO D22

ECO D00–D99 — Closed and Semi-Closed Games: 1.d4 d5 queen's pawn openings and the Grünfeld Defense.

3 named opening lines are classified under ECO code D22.

Queen's Gambit Accepted: Alekhine Defense — 1.d4 d5 2.c4 dxc4 3.Nf3 a6
Queen's Gambit Accepted: Alekhine Defense, Alatortsev Variation — 1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e3 Bg4 5.Bxc4 e6 6.d5
Queen's Gambit Accepted: Alekhine Defense, Haberditz Variation — 1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e3 b5