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Encyclopedia of Chess Openings

Eco Code

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  • A00-A99
    • A00-A09
    • A10-A19
    • A20-A29
    • A30-A39
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  • B00-B99
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  • D00-D99
    • D00-D09
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    • D40-D49
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ECO	Opening Name		DOWNLOAD!
D20	Queen's gambit accepted	D20	1.d4-d5; 2.c4-dxc4
	1) 3.e4 variation		3.e4
	2) Rest in D20		Rest
D21	Queen's gambit accepted	D21	1.d4-d5; 2.c4-dxc4; 3.Nf3
	(3.Nf3)
	1) Ericson variation		3...b5
	2) Alekhine defense, Borisenko-		3...a6; 4.e4
	Furman variation
	3) Rest in D21		Rest
D22	Queen's gambit accepted:	D22	1.d4-d5; 2.c4-dxc4;
	Alekhine defense		3.Nf3-a6
	1) Alatortsev variation		4.e3-Bg4; 5.Bxc4-e6; 6.d5
	2) Haberditz variation		4.e3-b5
	3) Rest in D22		Rest
D23	Queen's gambit accepted	D23	1.d4-d5; 2.c4-dxc4;
			3.Nf3-Nf6
	1) Mannheim variation		4.Qa4
	2) Rest in D23		Rest
D24	Queen's gambit accepted	D24	1.d4-d5; 2.c4-dxc4;
	(4.Nc3)		3.Nf3-Nf6; 4.Nc3
	1) Bogolyubov variation		4...a6; 5.e4
	2) Rest in D24		Rest
D25	Queen's gambit accepted	D25	1.d4-d5; 2.c4-dxc4;
	(4.e3)		3.Nf3-Nf6; 4.e3
	1) Smyslov variation		4...g6
	2) Janowsky-Larsen variation		4...Bg4
	3) Flohr variation		4...Be6
	4) Rest in D25		Rest
D26	Queen's gambit accepted	D26	1.d4-d5; 2.c4-dxc4;
	(4...e6)		3.Nf3-Nf6; 4.e3-e6
	1) Classical variation		5.Bxc4-c5
	2) Rest in D26		Rest
D27	Queen's gambit accepted	D27	1.d4-d5; 2.c4-dxc4;
	(6...a6)		3.Nf3-Nf6; 4.e3-e6;
			5.Bxc4-c5; 6.O-O-a6
	1) Rubinstein variation		7.a4
	2) Geller variation		7.e4
	3) Rest in D27		Rest
D28	Queen's gambit accepted	D28	1.d4-d5; 2.c4-dxc4;
	(7.Qe2)		3.Nf3-Nf6; 4.e3-e6;
			5.Bxc4-c5; 6.O-O-a6;
			7.Qe2
	1) 7...b5 variation		7...b5
	2) Rest in D28		Rest
D29	Queen's gambit accepted	D29	1.d4-d5; 2.c4-dxc4;
	(8...Bb7)		3.Nf3-Nf6; 4.e3-e6;
			5.Bxc4-c5; 6.O-O-a6;
			7.Qe2-b5; 8.Bb3-Bb7
	1) Smyslov variation		8.Bb3-Bb7; 9.Rd1-Nbd7;
			10.Nc3-Bd6
	2) Rest in D29		Rest

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