Database:GAMEBASE   ***   Top 40 ECO   ***



     ECO                                    Tot     +     ½     -   Perc  Elo



  1. D10 Queen's Pawn Gambit (Slav         2938   1043  1349   546   58%  2535  

  2. D30 Queen's Gambit (without Nc3)      2030    768   859   403   58%  2521  

  3. A30 English Opening (Symmetrical      1964    697   919   348   58%  2536  

  4. C88 Ruy Lopez (Closed System)         4641   1624  2134   883   57%  2579  

  5. A16 English Opening                   4155   1642  1522   991   57%  2478  

  6. E00 Catalan System                    3567   1347  1442   778   57%  2530  

  7. B07 Pirc Defence                      2208    910   698   600   57%  2722  

  8. A40 Unusual Replies to 1.d4           8058   3087  2879  2092   56%  2490  

  9. A13 Reti Opening                      3313   1135  1465   713   56%  2514  

 10. A15 English counter King's            3046   1072  1284   690   56%  2491  

 11. E60 King's Indian Defence (without    3020   1065  1253   702   56%  2521  

 12. B00 Owen Defence, Nimzowitsch         2706   1143   763   800   56%  2408  

 13. B01 Centre Counter                    2147    860   686   601   56%  2403  

 14. A05 Transitions into various         15051   5058  6666  3327   55%  2476  

 15. D02 Queen's Pawn Game                 4375   1547  1767  1061   55%  2475  

 16. B12 Caro Kann (Advance Variation)     3061   1092  1196   773   55%  2514  

 17. A06 Zukertort Opening                 2376    767  1086   523   55%  2564  

 18. D31 Queen's Gambit (Semi-Slav         2196    757   918   521   55%  2461  

 19. A04 Dutch System                      7892   2703  3171  2018   54%  2502  

 20. E61 King's Indian Defence             5875   2018  2378  1479   54%  2467  

 21. A48 King's Indian Defence (without    5101   1833  1919  1349   54%  2460  

 22. E10 Blumenfeld Counter Gambit         3948   1243  1845   860   54%  2567  

 23. A41 Modern Defence counter 1.d4       2708    982   994   732   54%  2489  

 24. A56 Old Indian Defence                2625    996   861   768   54%  2438  

 25. B90 Sicilian Defence (Najdorf         2549    982   800   767   54%  2520  

 26. E12 Queen's Indian Defence            2136    697   941   498   54%  2534  

 27. A07 Barcza System (with               2067    688   890   489   54%  2478  

 28. A46 Queen's Pawn Opening              8517   2838  3418  2261   53%  2495  

 29. A10 Dutch, Queen's Indian and         4006   1393  1537  1076   53%  2494  

 30. C00 French Defence (Unusual Moves)    2256    872   692   692   53%  2336  

 31. B30 Sicilian Defence (Rossolimo       2245    806   794   645   53%  2435  

 32. B40 Sicilian Defence (Classical       6061   2144  2124  1793   52%  2485  

 33. B33 Sicilian Defence                  4542   1564  1624  1354   52%  2453  

 34. B06 Modern Defence                    4363   1597  1419  1347   52%  2466  

 35. A00 Irregular Openings                4090   1447  1410  1233   52%  2413  

 36. B32 Sicilian Defence                  2645    908   986   751   52%  2428  

 37. B22 Sicilian Defence (Alapin          4062   1265  1538  1259   50%  2422  

 38. A45 Queen's Pawn Opening              3223   1122  1000  1101   50%  2477  

 39. B23 Sicilian Defence (Closed          2928    996   992   940   50%  2495  

 40. B50 Sicilian Defence (Variations      2089    658   720   711   48%  2459