The rule is simple, the classic board game "Hasami Shogi".

▼ Hasami Shogi rules
・ Move the pieces alternately
-You can take it by sandwiching the piece of the opponent's piece.

▼ About victory conditions
You can win with either
・ Either one takes 5 cards first
・ The game will be decided if the number of pieces taken is 3 pieces different.
However, the match will continue as soon as the opponent recovers the pieces, instead of having a match immediately after the difference of 3 cards.