Tressette a chiamare

The game algorithm is at an early stage of development and will be improved from version to version, but it should already allow some playability.
Three players, 12 cards each and 4 cards to constitute the "mountain" covered on the table. The game begins with a declaration phase. the players speak in turn, and based on the cards in hand they must decide whether to open the game, raise an opening bid or fold. The possible declarations are:
"CALL": the player declares that he will play by calling a card he is missing (obligatorily in order: a three, a two, an ace, etc.). If he receives the card from an opponent, he must return one at will.
"ONLY": the player declares that he will play without asking for any cards but using only the mountain.
"SOLISSIMO": the player declares that he will play only with the cards already in hand, without taking the mountain.
The player who wins the bidding round will then have to sort, that is, possibly return a card to the opponent who gave the called card and put 4 cards of his choice back into the pile. The game is then played according to the rules of tressette. Whoever wins the last hand will also win the cards of the mountain, which will contribute to the point count.
If you declare "CALL" and win, you earn 2 points, opponents -1. The points up for grabs double playing "SOLO" and triple playing "SOLISSIMO".