Guess what?

A single-player card game, the side who reaches the score of 15 will win.

Deal:

The cards involved in this game involved 6 cards, consisted with pairs of K, Q, J.  In the begining of game, it will be two cards dealed to the opponent as the cards that opponent selected, and four cards will be dealed to the player, two of them as default selection, two of them as the cards in your hand.  

Some cards will be face up, base on those information to make subsequent decisions.

Switch or not:

You can choose to switch one of your card in your hand with one in default selection, or click the "No Switch" botton to not switch.

You can't change your mind once you click one card, for example, when you choose one card in your hand, you can't say "I don't want that" and choose the another one in your hand, this rule also applies to the card in the default selection, so be careful.

Only one switch can be made in per turn.

Show the Card!

If you click "No Switch" botton or finish one switch, you and your opponent will show your cards, to see who wins in this turn and gets the score.

Score Explaination:

K>Q>J, and pair greater than any sets of two different cards

If both sides have same cards (draw):

Player: -1 scores

If both sides are both having  pairs (pair fight):

Side win by 2K: +5 scores

Side win by 2Q: +4  scores

If one side has any pair and one side doesn't:

Side win by pair: +3 scores

If both sides don't have pair:

Opponent with greater combination: +2 scores

Player with greater combination: +1 score