At the 2001 Berkshire meeting, Patrick Wolff played as many as six blindfolded chess games simultaneously.

True: contemporaneous accounts show that Patrick Wolff played blindfold chess against several opponents at the same time at the 2001 Berkshire annual meeting, with a maximum of six simultaneous games. Mostly true: he gave blindfold simultaneous exhibitions at that meeting, but the maximum number differs by one, or the event was at an associated weekend event rather than the meeting itself. Mostly false: he played at the meeting, but not blindfolded, or with a clearly different number of games (for example three or fewer). False: evidence shows he did not play at the 2001 meeting weekend.

Set before the research began.

1. E1 Patrick Wolff: From Chess Master To Value PM [VIDEO] Hedge Fund Alpha · 14 May 2013

   “Yahoo Finance posed a line of questions to Patrick Wolff, chief investment officer at Grandmaster Capital, on the sidelines of the Berkshire Hathaway (BRK-A, BRK-B) shareholder meeting in Omaha, where he was a spectator and performer, showing off his skills playing blindfolded chess against six players at once.”

2. E2 Berkshire Hathaway Annual Meeting 2001 Transcript good-investing.net (third-party transcript, edited by the site)

   “I’m Warren Buffett, chairman of the board of directors of the company, and I welcome you to this 2001 annual meeting of shareholders.”

E1 is a 2013 report of Patrick Wolff playing blindfold chess against six players at once at a Berkshire meeting in Omaha. The quoted passage [E1] doesn't give the year of that meeting, so it does not show whether the exhibition it describes was the 2001 one. E2 shows only that a 2001 annual meeting took place and doesn't mention Wolff or chess. No contemporaneous account confirms the 2001 exhibition or how many games he played at once.