Advice on good chess game for Slackware
I just finished installing Slackware/MLED 14.1 on a new client's desktop PC, as a replacement for Windows XP. The client has a second PC, still running Windows XP, with a chess game on it. Now I'd like to provide him a good equivalent on his Slackware installation. I have to deliver the PC on Monday afternoon, so I have a little time left to fiddle with that.
What chess program can the chess players among you recommend?