Gin Rummy Strategy
In online gin rummy you observe what the opponent is discarding and which of your discarded cards he is drawing. All discarded cards have to be also memorized. Based on the above and own hand cards, an inference is made as to the structure of opponents hand on the assumption that opponent is trying to make melds as best as he/she can.
It is unadvisable to go all out for gin hand online. The bonus of 25 is not sufficient to compensate for the times when you should have knocked.
Typical game ends at half-deck to 2/3 of deck, so knockers should not hesitate to do so earlier than that.
It is generally better to draw a deck card than an upcard because less of your hand will be known to your online opponent. Also, if you take upcard -you are taking cards of no use to your online opponent, but drawing from deck you may be preventing him/her going for a gin hand.
The best game exception to the above rule is when you need the upcard to convert 2 matching cards into a meld of 3 or more thus eliminating 3 pieces of deadwood including the upcard. It is especially good if it enables you to knock immediately.
When you suspect an imminent knocking from your online opponent (far into the deck > 2/3) it may be worth taking a low upcard and throw any high-value deadwood.
It is good to retain high-ranking pairs and 2-card sequences acquired early in the online game in the hope that opponent will discard a matching 3-d. Thus, 3 high-ranking pieces can be potentially eliminated. Conversely, it is a good idea to delay discarding high-ranking non-paired unmatched deadwood until later in the online game to prevent the opponent from creating high-ranking melds.
In arranging your melds after knocking, prefer to attach a card to a set of 4 rather than a sequence if it could equally well go with either. This way, you prevent your online opponent from laying off his/her deadwood against it, attaching to your meld.
Before reaching half-deck, you can retain the high-value potential unmelded combinations (such as Ten plus Queen of Hearts waiting/hoping for in-the-middle Jack of Hearts). However, after reaching half-deck with unfulfilled hopes, it is advisable to discard these cards. Such discarding should be started such that it would not give your online opponent higher chances to form melds and knock in the game.