Wine? you will need multilib, or a 32 bit machine.

Mine is a 64-bit machine. I guess I therefor need multilib. But what is multilib?

EDIT: well, I did a search and foundHow do I install multilib?

A good question. The short Answer is that if you're on slackware, you download Alien Bob's compat32 packages, and follow instructions He has a few composite packages to make the whole thing easier.

The problem is that each program references basic libs in /lib & /usr/lib. Now they are 32bit or 64 bit. So if they are 64bit, 32bit programs can't use them, & vice versa, because 32≠64. Slackware (& Fedora?) and maybe others solve it by using /lib & /usr/lib for 32bit libs, and/lib64 & /usr/lib64 for 64bit libs So a 32bit /lib/ld-linux.so can coexist with a 64bit /lib64/ld-linux.so. If your distro just has /lib & /usr/lib, it augurs very badly.

You can dual boot a 32bit OS, but that's a major PITA.

My solution: I am installing Windows 10. In that way I hope I can run chess.exe, which, among all chess programs I know, is by far the one I like most. This, has the 2-player capability.

It's a good question. Chess clocks are certainly more than $5 so a computer program is better for playing speed chess. On my Android phone, Chess Free has 1 or 2-player modes. Playing on a single phone or tablet it can flip the board to show it properly when two people play across the lunch table from each other.

Programs like Pychess on Linux seem to require 2 computers and login to a server to have 2-player mode. It also lacks the feature to sweep all the pieces off the board when you lose which I haven't seen in any program (sorely missed).

PyChess and Gnome Chess both allow two humans to play offline on a single computer, and both include the ability to save and restore games.

I have just installed Gnome Chess and it does have 2-player mode!

Too late to help now, but I just found out that in Xboard you can have two human chess by selecting