Over the past four decades the Chinese fuseki has settled down into a system where White has played (from nirensei) all of the moves shown below:
The favoured plays (according to the GoGoD database) are, in order, A ~ R. A, B and C together account for almost two thirds of the games, and A does give White one of the best winning returns. Adding D, E and F accounts for almost 80% of White replies. B, by the way, though often played, gives White a very poor return - less than 40% games won. One reason to be cautious of playing moves based on database searches!
Now it should be pointed out that this database approach to go seems to be anathema to pros we have talked to in Japan, China and Korea. Indeed, many of them seem to be reluctant even to look at games digitally. They appear to prefer to look at a written record, register the opening moves and then do the rest inside their heads. That is not to say they do not study opponents fully. For example, before the 3rd Kisei title match in the pre-database days of 1979, even the supremely self-confident Fujisawa Hideyuki set to studying all of challenger Ishida Yoshio's games for the previous two years. He remarked, incidentally, that not only was Ishida strong, but the more he studied the games the more he felt Ishida's strength. But in Game 4 he used against Ishida the very same high Chinese with which Ishida had trounced Sakata Eio in the Challengers' Final. We have an impression that psychology plays a hugely more important role at this level than knowledge of specific openings or winning percentages.
Despite that, it was fascinating to us to see what Kono Rin came up with as White's plausible moves:
Kono has not labelled the moves in percentage order, but in simple reading order (the Japanese magazine is read right to left). Neverthless, he has the same basic shape as the database search, and from the text it is apparent that his C and F are the two most important moves in the array (A and C in the database version). Furthermore, he has omitted the poor database move B in the top right (though possibly just because his concern is with the lower right). At any rate, whether he used a database or not, both our database and he seem to agree on the basic options. Which, incidentally, leaves some thought-provoking questions: why has the move below F in the database map never been played by pros even though every other point round about has, and why has White hardly ever played on the lower right side (both popular options with amateurs)? And why have even pros as White persisted in trying database B?