Gin Rummy

Make Gin Rummy for two players against the computer. 10 cards each; on a turn draw from the stock or take the top discard, then discard one card. Melds are sets of 3 or 4 of the same rank, or runs of 3 or more in one suit (ace is low only). A player may knock when unmatched cards (deadwood) total 10 or less; gin means zero deadwood. After a knock the opponent can lay off cards onto the knocker's melds, and an undercut happens when the knocker's deadwood is not lower. Score the deadwood difference, plus 20 for gin and 10 for an undercut, and play to 100. Show the hand sorted with the best meld grouping and the deadwood total highlighted. The computer should take discards that complete melds, discard high unmatched cards, and knock when sensible. Add a hint button.