Trying to access https://www.chesspub.com/cgi-bin/chess/YaBB.pl?num=1159984243/60 gives a stack trace:
-.> quotemsg('Scholar', '1159984243/60#61', '1160289239^J^JSL [/quote',
-.> timeformat('1160289239^J^JSL [/quote', 0, 0, 0, 1)
-.> complains that "1160289239\n\nSL [/quote" is not a number.

It's interesting that the chesspub url parameter is handled differently when logged in versus when not logged in. I much prefer the not logged in behavior.

• Logged in ?num=1159984243/56 gives Reply #45 .. #59
• Not logged in ?num=1159984243/56 gives Reply #56 .. #70

Plunking around when not logged in seems to show the problem is in reply #70.