Kontraspiel, also called Contra, is a German 5-card plain-trick game for four individual players using 24 cards. Eldest hand has the first right to accept or make trumps. The Unters of Acorns and Leaves (the equivalent of the two black Jacks) are permanent highest trumps, the "Wenzels". Kontraspiel is similar to the Scandinavian game Polskpas and is recorded as early as 1811.
History.
The earliest mention of Contra appears in a list of games in a 1755 poem. In 1773 it is described as one of the games played with "German cards" i.e. a 32-card German-suited pack, and, in 1786 it was reported that, along with Trischaken, it was a very popular game among the peasants in German-speaking lands. 
The earliest rules appeared in the same 1773 source under a separate entry, but the first comprehensive account is given in Hammer's 1811 edition of "Die deutschen Kartenspiele". and then re-surfaces from 1853 to 1879 in various German games compendia. It may be an elaboration of Polskpas. Having the two black jacks is reminiscent of Euchre.
Card ranking.
Tens are low. The two "Wenzels" are the highest members of the trump suit, with the U ranking higher than the U. A "Wenzel" is not part of its natural suit unless this happens to be the trump suit. If the trump suit is either Hearts or Bells there are 8 trumps. Otherwise there are only seven trumps.
Basic concept.
There are four players. Each one receives 5 cards in batches of 2–3 or 3–2. The remaining 4 cards are not used in the game, except for the first of them, which is turned face-up to determine the preferred trump suit. The actual trump suit is decided in a negotiation phase described in the next section.
The standard rules of trick-play as in Whist apply. Eldest hand leads to the first trick. Suit must be followed. The player who played the highest trump, or the highest card of the suit led, wins the trick and leads to the next. To win the game one must win 3 tricks. To make sure that there is always a winner, it is also enough to be the first player to win 2 tricks, so long as the other tricks do not all fall to the same player. A player who does not win a single trick is said to be "revolted". A player who wins all 5 tricks is said to make the "match".
Soloist, contra and recontra.
Starting with eldest hand, each player gets the chance to become soloist with the preferred suit as trumps. If everybody passes, there is a second round in which each player gets the chance to become soloist with a different suit. In the second round, eldest hand is the only player who is allowed to do this with the preferred suit. If the second round fails as well, the game is not played and the next dealer deals.
In the event that the turn-up card is a "Wenzel", the dealer automatically becomes soloist with the card's natural suit as trumps. In this case the dealer takes up the card and discards another card face-down to get his or her hand down to 5 cards.
If the turn-up card is an Ace and the dealer has not yet looked at his or her hand, then he or she can choose whether to follow the procedure just described for Wenzels. However, if the player has once chosen to take up the game in this situation, automatically does so. This tacit agreement is ended in case it causes the dealer to be revolted.
Under certain conditions another player may "announce match", replace the original soloist, and determine a new trump suit:
A player who announces match must choose a trump suit other than the preferred suit.
At any time before the second trick has been started, any player other than the soloist may announce "contra". If all of the following conditions are satisfied, the contrarian is allowed to replace one of his or her hand cards by the turn-up card:
In particular, if the dealer initially passed and then chose to take the game in the second round in the preferred suit, then the turn-up card even is in the trump suit but the contrarian may not take it. This is an incentive for the dealer to pass in the first round.
If contra has been announced, then at any time before the third trick has been started, a third player may announce "recontra". This can occur in practice when such a third player has been surprised by winning the first two tricks and is sure that no other player will win two tricks.
Scoring.
The game is played for money and uses a pot for the stakes. The dealer pays one unit into the pot before the game starts. The base value of any game is as much as the pot contained before the game, but at least one unit and at most four units.
Every soloist, contra player or recontra player receives or pays the base value from or to the pot, depending on whether the player won or lost. In the event that a player wins unexpectedly, without being the soloist, contra player or recontra player, the player receives nothing but the soloist and any contra or recontra player must still pay.
Additional side-payments are made in case a soloist matches or a soloist, contra player or recontra player is revolted.
In either case the amount is doubled if the preferred trump suit was played. In the first case the amount is also doubled if the match was announced.
Moreover, a player who announced match but did not make it pays two units to every opponent. Such a player may still have won or lost the game in the normal way. The player is only treated differently from a normal soloist for the purposes of the side-payments.
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