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The three personality types in the Enneagram's competency triad are
distinguished by how they relate to rules, and this bears on how members
of these three types approach Chess variants. The three types in this
triad are One, Three, and Five. Type One likes to obey rules. Type Three
likes to master rules. And type Five likes to play with rules.

While Ones like to obey rules, they sometimes feel dissatisfied with the
rules, seeking to reform them or supplant them. Enneagram author Don Riso
calls type One the Reformer. When a One is interested in creating Chess
variants, it is usually out of a feeling of dissatisfiaction with Chess
and other variants. A One typically seeks to create the perfect variant,
and he may devote his efforts to perfecting one variant rather than to
creating several variants.

Unlike Ones, Threes aren't driven to create the perfect game. A Three
is more likely to be driven to be good at a game. I expect that several of
the most accomplished players are Threes. Threes generally don't have
any inner drive to create new variants, but if a Three perceives a market
for a new variant, he may create one, then invest his time and money into
promoting it and marketing it. Threes are driven mainly by a desire for
success, and for some Threes promoting a new Chess variant may be a means
to success.

Fives like to play and tinker with rules. When a Five is interested in
Chess variants, he generally likes to play with Chess like it's a box
of Legos or Tinker Toys, mixing and matching various rules, pieces, and
boards to try out various possibilities. While Fives may employ standards
in creating their games, they generally regard the perfect variant as a
myth. For them, creating variants is more like playing with a kaleidescope
than it is about seeking perfection. Although Fives may like to see their
games manufactured, they generally lack a marketing orientation, and they
are usually too busy working on their next variant to spend much time
promoting their last one. Fives tend to create several more variants than
other types do.

There are six other Enneagram types, but the other six are probably less
interested in creating Chess variants. This doesn't rule out the
possibility that some variants have been created by other types, but it
may be rare.