{"id":7088,"date":"2026-03-18T06:42:11","date_gmt":"2026-03-18T06:42:11","guid":{"rendered":"https:\/\/www.guillembaches.com\/chess\/?page_id=7088"},"modified":"2026-03-18T16:02:30","modified_gmt":"2026-03-18T16:02:30","slug":"eco","status":"publish","type":"page","link":"https:\/\/www.guillembaches.com\/games\/eco\/","title":{"rendered":"ECO"},"content":{"rendered":"\n

Dive into our comprehensive ECO codes<\/strong> section, featuring the full A00-E99 system from the Encyclopaedia of Chess Openings. Discover opening families, sub-variations, and stats\u2014ideal for players sorting databases, studying plans, or finding games. From Queen’s Gambit (D20s) to Najdorf (B90), enhance your prep with precise classifications and expert insights.<\/em><\/p>\n\n\n

A00<\/a>\nA03<\/a>\nA06<\/a>\nA15<\/a>\nA41<\/a>\nA48<\/a>\nA65<\/a>\nB00<\/a>\nB01<\/a>\nB07<\/a>\nB13<\/a>\nB20<\/a>\nB40<\/a>\nB50<\/a>\nB54<\/a>\nB57<\/a>\nB92<\/a>\nB99<\/a>\nC01<\/a>\nC07<\/a>\nC11<\/a>\nC40<\/a>\nC44<\/a>\nC46<\/a>\nC48<\/a>\nD02<\/a>\nD03<\/a>\nD10<\/a>\nD15<\/a>\nD31<\/a>\nD35<\/a>\nD36<\/a>\nD37<\/a>\nD38<\/a>\nD43<\/a>\nD85<\/a>\nE00<\/a>\nE10<\/a>\nE12<\/a>\nE32<\/a>\nE39<\/a>\nE46<\/a>\nE81<\/a>\nE92<\/a><\/p>\n\n\n

A: Flank Openings<\/h2>\n\n\n\n

Volume A covers irregular starts, flank attacks, and sidelines like 1.c4 or 1.Nf3. Key families include English Opening (A10-A39, 1.c4), R\u00e9ti (A04-A09, 1.Nf3), Bird’s (A02-A03, 1.f4), and Nimzowitsch-Larsen (A01, 1.b3). Dutch Defense (A80-A99, 1.d4 f5) and Benoni (A50-A79) add dynamic counterplay.<\/a>\u200b<\/p>\n\n\n\n

B: Semi-Open Games<\/h2>\n\n\n\n

B focuses on Black’s asymmetric replies to 1.e4, like Sicilians and Caro-Kann. Sicilian dominates with Najdorf (B90-B99, …a6), Dragon (B70-B79, …g6), and Taimanov (B40-B49, …e6). Others: Alekhine (B00-B05, 1.e4 Nf6?), Pirc\/Modern (B06-B09), Caro-Kann (B10-B19, 1.e4 c6).<\/a>\u200b<\/p>\n\n\n\n

C: Open Games and French<\/h2>\n\n\n\n

C includes 1.e4 e5 (double king pawn) plus French Defense. Ruy Lopez (C60-C99, 3.Bb5) leads, followed by Italian (C50-C59, 3.Bc4), Scotch (C44-C45, 3.d4), Petrov (C42-C43), and King’s Gambit (C30-C39, 2.f4). French starts with C00-C19 (1.e4 e6).<\/a>\u200b<\/p>\n\n\n\n

D: Closed Queen’s Pawn Games<\/h2>\n\n\n\n

D handles 1.d4 d5 structures, Queen’s Gambit, and Gr\u00fcnfeld. Queen’s Gambit Declined (D30-D69) is core, with Slav (D10-D19, …c6), Accepted (D20-D29, …dxc4), and early systems (D00-D09 like London). Gr\u00fcnfeld (D80-D99, …g6) brings hypermodern tension.<\/a>\u200b<\/p>\n\n\n\n

E: Indian Defenses<\/h2>\n\n\n\n

E features …Nf6 setups with …e6 or …g6, like Nimzo-Indian and King’s Indian. Nimzo (E20-E59, 3.Nc3 Bb4) splits into S\u00e4misch and Classical; Queen’s Indian (E12-E19, …b6); Catalan (E01-E09). Early branches in E00-E11 transition flexibly<\/p>\n\n\n

A00<\/a>\nA03<\/a>\nA06<\/a>\nA15<\/a>\nA41<\/a>\nA48<\/a>\nA65<\/a>\nB00<\/a>\nB01<\/a>\nB07<\/a>\nB13<\/a>\nB20<\/a>\nB40<\/a>\nB50<\/a>\nB54<\/a>\nB57<\/a>\nB92<\/a>\nB99<\/a>\nC01<\/a>\nC07<\/a>\nC11<\/a>\nC40<\/a>\nC44<\/a>\nC46<\/a>\nC48<\/a>\nD02<\/a>\nD03<\/a>\nD10<\/a>\nD15<\/a>\nD31<\/a>\nD35<\/a>\nD36<\/a>\nD37<\/a>\nD38<\/a>\nD43<\/a>\nD85<\/a>\nE00<\/a>\nE10<\/a>\nE12<\/a>\nE32<\/a>\nE39<\/a>\nE46<\/a>\nE81<\/a>\nE92<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Dive into our comprehensive ECO codes section, featuring the full A00-E99 system from the Encyclopaedia of Chess Openings. Discover opening families, sub-variations, and stats\u2014ideal for players sorting databases, studying plans, or finding games. From Queen’s Gambit (D20s) to Najdorf (B90), enhance your prep with precise classifications and expert insights. A: Flank Openings Volume A covers…<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"disable","_kad_post_title":"show","_kad_post_layout":"narrow","_kad_post_sidebar_id":"","_kad_post_content_style":"default","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"class_list":["post-7088","page","type-page","status-publish","hentry"],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false},"uagb_author_info":{"display_name":"Guillermo Baches","author_link":"https:\/\/www.guillembaches.com\/games\/author\/guillermo\/"},"uagb_comment_info":0,"uagb_excerpt":"Dive into our comprehensive ECO codes section, featuring the full A00-E99 system from the Encyclopaedia of Chess Openings. Discover opening families, sub-variations, and stats\u2014ideal for players sorting databases, studying plans, or finding games. From Queen’s Gambit (D20s) to Najdorf (B90), enhance your prep with precise classifications and expert insights. A: Flank Openings Volume A covers...","_links":{"self":[{"href":"https:\/\/www.guillembaches.com\/games\/wp-json\/wp\/v2\/pages\/7088","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.guillembaches.com\/games\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.guillembaches.com\/games\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.guillembaches.com\/games\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.guillembaches.com\/games\/wp-json\/wp\/v2\/comments?post=7088"}],"version-history":[{"count":6,"href":"https:\/\/www.guillembaches.com\/games\/wp-json\/wp\/v2\/pages\/7088\/revisions"}],"predecessor-version":[{"id":7280,"href":"https:\/\/www.guillembaches.com\/games\/wp-json\/wp\/v2\/pages\/7088\/revisions\/7280"}],"wp:attachment":[{"href":"https:\/\/www.guillembaches.com\/games\/wp-json\/wp\/v2\/media?parent=7088"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}