How a game of Gin rummy against bots works here: seating them, what they can see, how they decide, and what they leave to you.
Gin rummy is a game for exactly two, so a game against the computer is you and one bot. Open a table, press "Add an opponent" in the lobby, and choose how long the game is: to 100 points, or to 250 for a longer match. Then start — the bot needs no other settings.
Only the host can seat the bot, and only before the first deal. It sits down with a name and a tag that says bot.
Its own ten cards and the discard pile, and nothing else. Your hand stays on the server, and the bot plays on the server too, so it has no way to look at your cards. It does not see the stock either — when it draws, it gets whatever is on top, the same as you.
It takes about a second over each move, so you can see which pile it drew from and what it threw.
The bot thinks about its own hand and nothing else. It takes the top of the discard pile only if its hand would be left with less deadwood by doing so; otherwise it draws from the stock. Then it throws whichever card leaves it with the least deadwood, and the dearest of the equal choices.
It always knocks when it has gin. With a little deadwood — five or less — it knocks straight away. With six to ten it sometimes knocks and sometimes waits a turn in the hope of getting lower, which keeps it from being undercut as often as a player who knocks the moment they can.
Watch the pile. The bot never takes a discard it cannot use, so every card it picks up tells you something it is building. Once it has taken a seven, keep your sevens and the cards next to it in suit to yourself.
The bot does not track what you have picked up, so it will happily throw you the card you need. And since it often waits with six to ten points of deadwood, knocking early with a low count catches it holding more than it would like.
Every hand is scored the moment somebody knocks: the difference in deadwood, plus 25 for gin or for an undercut. At the end the winner gets 100 for reaching the target and 25 for every hand they won. After each hand, press "Ready for the next hand"; the bot is always ready.
If you close the tab mid-hand, your seat is held for twenty-five seconds. After that the site plays your hand until you come back, and you get your seat back the moment you open the table again.