29 Card Game Strategy

Bid on Jacks, keep the trump quiet, and ask for it when the trick is worth it.

Good 29 card game strategy comes down to three things: bid on the Jacks and Nines you actually hold, play the early tricks as if there were no trump, and ask for the reveal only when the trick in front of you carries points. The deck has 28 points in it (Jack 3, Nine 2, Ace and Ten 1 each), and Kings and Queens win tricks worth nothing, so every decision is about where those points end up.

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On four cards: the bid

16 already promises more than half the deck. A Jack and a Nine in your four cards is 5 of the 28. Bidding 16 means counting on your partner and your last four cards for the rest.
Three of a suit is worth more than it looks. A suit you can make trumps, with three or four cards in it, turns into tricks once the trump is out. Our bots score a hand the same way: point cards first, a little extra for each Jack and Nine, and more again for three cards of one suit.
Half your hand isn't dealt yet. You bid on four cards; the other four come after. Bid the cards you hold, not the ones you hope for.
Go above 20 only with the Jacks to back it. Overbidding costs a game point straight away, and only your side's score moves when you miss.

Choosing the trump

Pick the suit you are longest in, then the one with the Jack. Length matters more than a single big card: once trumps are out, even the 8 of trumps beats an Ace of another suit. Our bots choose the same way, length first and then the point cards, with an extra lean towards the suit holding a Jack.

Before the reveal

Your trumps are ordinary cards for now. Until someone asks, the highest card of the led suit wins, whatever suit is hidden. Play the early tricks as a plain game and pick up cheap points where you can.
Each trick tells you something. Watch who plays off-suit and who holds a Jack back. It all helps you guess the hidden suit before anyone asks.
Defenders: lead what the bidder looks short in. Make them choose between a cheap reveal and losing the trick.

When to ask for the trump

The harder bots on our tables follow a simple rule, and it is a sound place to start:

Don't ask if you hold no trumps. You would only show everyone the suit and gain nothing.
Don't ask while your partner is winning a cheap trick. Let them have it.
Ask when the trick holds 2 points or more, a Nine or a Jack, or an Ace and a Ten.
Late in the hand, ask anyway. From the sixth trick on there is little left to hide.

On our tables, the player who asks must play a trump on that trick if they hold one, so asking with a single small trump spends it. The Ask for trump button only appears on your turn when you can't follow suit, and you never have to tap it.

The pair: keep King and Queen together

Where the pair rule is played, the King and Queen of trumps shown after the reveal move the bidders' target by 4: down for the bidding side, never below the minimum bid, and up if the defenders hold them. A bid of 20 can come down to 16. So don't throw the trump Queen early just because it is worth zero. Our tables play the pair: the Declare marriage button appears straight after your side wins a trick and goes once the next card is played, so don't let the moment pass.

After the reveal: playing for points

Go after the rich tricks. A trick with a Jack and a Ten in it is 4 points, a quarter of a 16 bid. A trick of Kings is worth nothing.
Save trumps for tricks with points. Once the trump is out, the 7 of trumps takes a Jack of any other suit. Don't spend it on a trick of Kings.
Give your partner points. Drop Aces and Tens on tricks your partner is winning; drop Kings and Queens on the other side's.
Count to 28. Once the bid is safe, or out of reach, play the rest for the cheapest finish.

Five habits that lose 29 matches

Counting Kings and Queens as strength.
Asking for the trump just to win a trick with no points in it.
Splitting the King and Queen of trumps before the reveal, at tables that play the pair.
Bidding 20 or more without the Jacks to back it.
Throwing a Ten onto a trick the other side has already won.

One more for tables that double: if the defenders double, the hand is worth 2 game points and a redouble makes it 4, so one bad bid can cost 2 or 4 of the 6 game points at once. Our tables play both, with 8 seconds to decide before the first card. Computer players never double, so against them the stakes only rise when a human player doubles.