I was poking around on the Basic Fantasy forums when I came across a post by merias about how folks played OD&D, with a link to the Rythlondar Chronicles (originally uncovered and shared on Risus Monkey).
I’m always interested in hearing about how gamers were playing RPGs before I got my start (in 1987), and one topic that’s always fascinated me is player count. From what I’ve read, it was common for D&D sessions in the 1970s to have what would generally be considered a large number of players these days.
That’s neatly illustrated by the Rythlondar Chronicle, which documents the house rules, players, guidelines, and expeditions undertaken as part of a D&D campaign in Michigan in 1976. It started out with two GMs, John Van De Graaf and Len Scensny, who shared their campaign notes — the Chronicle — with Risus Monkey.
What merias pointed out is on page 9, EXPEDITION RECORDS.

That page (which is much easier to read in the PDF!) lists 12 expeditions, along with the player count and the PC death toll for each session. (I’ve included the fatality percentage in parentheses.)
- 12 players, 5 PC deaths (42%)
- 12 players, 3 PC deaths (25%)
- 10 players, 2 PC deaths (20%)
- 14 players, 6 PC deaths (43%)
- 7 players, 2 PC deaths (29%)
- 7 players, 0 PC deaths (0%)
- 12 players, 1 PC deaths (8%)
- 7 players, 1 PC deaths (14%)
- 15 players, 3 PC deaths (20%)
- 14 players, 5 PC deaths (36%)
- 8 players, 3 PC deaths (38%)
- 14 players, 0 PC deaths (0%)
Just look at those numbers: In Rythlondar, seven players was a slow night. The average player count was 11. (Those death counts are something, too — an average of 2.58 dead PCs per session, or 23%. On any given night, there was only about a 17% chance that no PCs would croak.)
I recognize that play style and game system make a big difference in the feasibility of gaming with a big group. OD&D (paid link) seems like an excellent fit for this; I can see why it would work with a lot of players. Practices like having a caller make a lot of sense in a large-group context, too.
I start getting twitchy at five players, and six feels unwieldy to me. I can’t imagine running a game for 11 players, let alone 15. But you know what? I’d like to give it a shot.

The Unlucky Isles [affiliate link], the first system-neutral guidebook for my Godsbarrow fantasy campaign setting, is now on DriveThruRPG.