Larger handicaps are certainly possible; but with such a great difference in strength, Black may be simply bewildered, and not understand how many of White's moves relate to his own.
Before the late 20th century, they were used as strength measurement, with a difference in skill of less than a third of a stone per rank.
Various estimates have been given for the factor that applies to 13×13, in the range 2.5 up to 4; and on grounds both theoretical and experimental (small-board tournament play).
Therefore, free placement handicap may be best suited for more experienced players or those who want more flexibility and variety in play.
However, there are still no absolute standards on the number of compensation points due to the difficulty of determining a fair value.
As no one can be absolutely sure what the fair number of compensation points is, some advocate another system which is often used in some amateur matches and tournaments.
Examples of auction komi systems include: Handicap go is the traditional form of teaching given to go players.
The "theory" of handicap go shares with much of the rest of the Japanese pedagogic go literature a less explicit approach, based on perception as much as analysis.
Whether fixed handicap placement makes it easier or more difficult for the weaker player to learn these fundamental points is moot.
Handicaps are also unpopular with Chinese players, who have more of a tradition of equality at the board rather than deference to a teacher.
There are some book treatments of low-handicap go by strong professionals (Kobayashi Koichi and Kajiwara Takeo, in particular); and examples of pro-pro games to follow.
With the traditional handicap placements, the only consistent strategy Black can follow depends on the use of influence.
If Black does not understand and utilize the value of star-point handicap stones for attack, White will gradually build a more advantageous position, and steadily close the gap.