This is a 5x5 grid version of the card game cribbage. Try it out.
You are P1 and the CPU is P2. You take turns placing the next card in the deck (shown at the top left) onto the 5x5 grid, by simply clicking on the space that you would like to place the card into. The CPU will then move automatically, making it your move again. You can also disable the CPU and play against a friend sharing a device.
Each round of the game consists of filling up the 5x5 grid with cards. At the end of the round, whoever has more points gets the difference added to their total points at the top, while the loser gets zero. Another round then begins.
Scoring is as follows. You, the row player, get points for the hands made up of each row of the grid. This is done according to standard cribbage rules. The CPU opponent gets points for each column of the grid. These hand totals are shown next to each row and column as the game progresses, and the large bold numbers show the totals for all rows (bottom left) and for all columns (top right).
Hands can score points in different ways. The total points for a hand is equal to the sum of the points that it scores for pairs, fifteens, runs, and flush.
A pair of cards is worth 2 points (e.g. two kings). A three of a kind contains 3 pairs, and is thus worth 6 points. A 4 of a kind contains 6 pairs (4 choose 2) and is worth 12 points.
Any combination of cards in your hand that adds up to 15 is worth 2 points (Ace = 1, JQK are 10 each). This makes the 5 very valuable because a lot of cards are worth 10. For example, a hand with A445J would have 3 fifteens: A4J, A4J with the other 4, and 5J. A hand of 66993 would have 5 fifteens: 4 possible versions of 69, and 663.
Having all 5 cards of the same suit is worth 5 points.
Having a run of cards (consecutive in rank) of length at least 3 is worth points equal to the length of the run. Ace here is low, and can only go with A23. AKQ is not allowed. For example 23456 has a run of length 5 for 5 points. 23445 has two runs of length 4 (depending on which 4 is used), so it has 8 points of runs. 33455 can 4 possible runs of length 3 (using either 3 and either 5), so it has 12 points of runs.
AA44J: This hand has 2 pairs for 4 points, and four 15s for 8 points (4 possible combinations of A4J), so is worth a total of 12 points.
44566: This hand has 2 pairs for 4 points, 4 runs of length 3 (versions of 456 using either 4 and 6) for 12 points, and 4 15s (4+5+6=15) for 8 points, for a total of 24 points.
5555J: This hand has a four of a kind for 12 points, 4 15s that consist of 3 5s for 8 points, and 4 15s that consist of J5 for another 8 points, for a total of 28 points. This is the best hand in the game.
To understand the scoring better, I recommend filling up the board randomly with cards and trying to count points, using the reported totals next to each row and column as a guide.
The CPU can be formidable, at least in our experience. I recommend playing CPU level 2 or 3 at first and then progressing.
Playing card images are in the public domain and available here.
Fronts: https://www.me.uk/cards/ © Copyright 2018 Adrian Kennard Released under CC0 Public Domain licence.
Blank and Astronaut Card Back: https://tekeye.uk/playing_cards/svg-playing-cards Published by dan@tekeye.uk
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