[Computer-go] The number of legal 18x18 Go positions is ...

[John Tromp]

669723114288829212892740188841706543509937780640178732810318337696945624428547218105214326012774371397184848890970111836283470468812827907149926502347633

More details at http://tromp.github.io/go/legal.html,
including a call for volunteers to contribute computing power for
determining what we all want to know, the number of 19x19 positions.

regards,
-John