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|
| Chess ECOs Found | Number Chess Games | Common ECO Name |
|---|
| C20 | 4124 | Kings Pawn Game includes Alapins Opening |
| C21 | 4254 | Center Game |
| C22 | 2636 | Center Game |
| C23 | 4411 | Bishops Opening |
| C24 | 9262 | Bishops Opening, Berlin Defense |
| C25 | 6157 | Vienna Game |
| C26 | 3767 | Vienna Game, Falkbeer Variation |
| C27 | 1865 | Vienna Game |
| C28 | 1016 | Vienna Game |
| C29 | 3674 | Vienna Gambit, Kaufmann Variation |
| C30 | 6690 | Kings Gambit |
| C31 | 2833 | Kings Gambit Declined, Falkbeer Countergambit |
| C32 | 1742 | Kings Gambit Declined, Falkbeer, 5. dxe4 |
| C33 | 2609 | Kings Gambit Accepted |
| C34 | 4415 | Kings Gambit Accepted |
| C35 | 1260 | Kings Gambit Accepted, Cunningham Defense |
| C36 | 1677 | Kings Gambit Accepted, Abbazia Defense Classical Defense, Modern Defense |
| C37 | 2596 | Kings Gambit Accepted, Quaade Gambit |
| C38 | 826 | Kings Gambit Accepted |
| C39 | 2313 | KGA, Allagier & Kiesertisky Gambits |
| C40 | 9991 | Kings Knight Opening includes Gunderam Defense, Greco Defense, Damiano Defense, Elephant Gambit, and |
| C41 | 13169 | Philidor Defense |
| C42 | 25134 | Petrovs Defense |
| C43 | 5984 | Petrovs Defense, Modern Steinitz Attack |
| C44 | 16389 | Kings Pawn Game includes Ponziani Opening, some Scotch Game |
| C45 | 19024 | Scotch Game |
| C46 | 3891 | Three Knights Game |
| C47 | 9864 | Four Knights Game, Scotch Variation |
| C48 | 2860 | Four Knights Game, Spanish Variation |
| C49 | 1934 | Four Knights Game, Double Ruy Lopez |
| C50 | 16046 | Kings Pawn Game includes Hungarian Defence and Giuoco Pianissimo |
| C51 | 2191 | Evans Gambit |
| C52 | 1884 | Evans Gambit with 4...Bxb4 5.c3 Ba5 |
| C53 | 2304 | Giuoco Piano |
| C54 | 8156 | Giuoco Piano |
| C55 | 10820 | Two Knights Defense |
| C56 | 3558 | Two Knights Defense |
| C57 | 4462 | Two Knights Defense |
| C58 | 1763 | Two Knights Defense |
| C59 | 1557 | Two Knights Defense |
| C60 | 4476 | Ruy Lopez |
| C61 | 2347 | Ruy Lopez, Birds Defense |
| C62 | 4535 | Ruy Lopez, Old Steinitz Defense |
| C63 | 6416 | Ruy Lopez, Schliemann Defense |
| C64 | 5151 | Ruy Lopez, Classical Cordel Defense |
| C65 | 6186 | Ruy Lopez, Berlin Defense |
| C66 | 988 | Ruy Lopez, Berlin Defense, 4.O-O, d6 |
| C67 | 4352 | Ruy Lopez, Berlin Defense, Open variation |
| C68 | 8919 | Ruy Lopez, Exchange Variation |
| C69 | 2550 | Ruy Lopez, Exchange Variation, 5.O-O |
| C70 | 4309 | Ruy Lopez |
| C71 | 1040 | Ruy Lopez, Modern Steinitz Defense |
| C72 | 2002 | Ruy Lopez, Modern Steinitz Defense 5.0-0 |
| C73 | 1101 | Ruy Lopez, Modern Steinitz Defense, Richter variation |
| C74 | 1079 | Ruy Lopez, Modern Steinitz Defense |
| C75 | 978 | Ruy Lopez, Modern Steinitz Defense |
| C76 | 232 | Ruy Lopez, Modern Steinitz Defense, Fianchetto Bronstein variation |
| C77 | 10588 | Ruy Lopez, Morphy Defense |
| C78 | 9583 | Ruy Lopez, 5.O-O |
| C79 | 1118 | Ruy Lopez, Steinitz Defense Deferred Russian Defense |
| C80 | 13293 | Ruy Lopez, Open Tarrasch Defense |
| C81 | 962 | Ruy Lopez, Open, Howell Attack |
| C82 | 1812 | Ruy Lopez, Open, 9.c3 |
| C83 | 1143 | Ruy Lopez, Open, Classical Defense |
| C84 | 1587 | Ruy Lopez, Closed Defense |
| C85 | 1813 | Ruy Lopez, Exchange Variation Doubly Deferred DERLD |
| C86 | 1247 | Ruy Lopez, Worrall Attack |
| C87 | 798 | Ruy Lopez, Closed, Averbach Variation |
| C88 | 5265 | Ruy Lopez, Closed |
| C89 | 7206 | Ruy Lopez, Marshall Counterattack |
| C90 | 2684 | Ruy Lopez, Closed with ...d6 |
| C91 | 1586 | Ruy Lopez, Closed, 9.d4 |
| C92 | 3961 | Ruy Lopez, Closed, 9.h3 |
| C93 | 635 | Ruy Lopez, Closed, Smyslov Defense |
| C94 | 191 | Ruy Lopez, Closed, Breyer Defense |
| C95 | 1824 | Ruy Lopez, Closed, Breyer, 10.d4 |
| C96 | 1432 | Ruy Lopez, Closed, 8...Na5 |
| C97 | 1206 | Ruy Lopez, Closed, Chigorin Defense |
| C98 | 612 | Ruy Lopez, Closed, Chigorin, 12...Nc6 |
| C99 | 1846 | Ruy Lopez, Closed, Chigorin, 12...c5d4 |
