When to declare in UnderTen

Declaring is the one decision in UnderTen you cannot take back. Call too early and someone with a lower hand takes the round. Wait too long and someone else calls first. This chart shows how often a declare wins, so you can stop guessing.

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The rule in one line

You may declare at the start of your turn, before drawing, when your hand adds up to 9 or less. You win only if your total is strictly lower than everyone else's. A tie goes against you. In a match to 50, losing a declare also adds 20 points to your score.

How we made the chart

We ran 200,000 rounds for each table size with the same rules code the game uses, with every player drawing and throwing like the UnderTen bots. Each time a player started a turn at 9 or less, we checked whether declaring right then would have won. The chart shows the share that would have. Real opponents are sometimes sharper than bots and sometimes not, so read the numbers as rough odds, not promises.

The turn numbers are your own turns. Turn 1 is your first time to play in the round. Nobody can declare on turn 1, because the lowest possible starting hand adds up to 10 (see UnderTen by the numbers).

The chart

Chance that a declare wins:

2 players

3 players

4 players (quick match)

5 players

6 players

What the chart tells you

Early beats low

The single biggest factor is not your total but how early it is. A 9 in your first five turns wins more often than a 4 after turn nine, at every table size. Every turn you wait, the other hands shrink too. If you get under 10 early, declaring at once is usually right, even with a 7, 8 or 9.

Late in the round, only very low hands are safe

From turn nine on, the other players have had time to get low. At a table of three or four, a declare at 7 to 9 that late wins only about one time in twenty. If it is late and your hand is still in that range, keep throwing your highest card instead. The round ends by itself after 12 turns each, and the lowest hand wins without anyone declaring.

Big tables are kinder than you think

It sounds as if more players means more risk, and at the same turn that is partly true. But at five or six players the deck is small and recycles the high cards people threw, so most hands never get under 10 at all. A player who does get there is often far ahead. Compare the turns 9–12 column for four players and for six.

Two players is about timing

With only one opponent, there is one hand to beat. Early in the round almost any declare wins. Later, your opponent has had as many turns as you, and a declare at 4 to 6 wins less than half the time.

Adjusting for a match to 50

In a match, a lost declare costs your hand total plus 20. A won declare costs nothing for that round. So the chart is not the whole story:

• When your score is low, a declare with a 60% chance is a good bet. Even when it fails you are unlikely to be knocked out.
• When you are near 50, a failed declare can end your match. Declaring at 9 and losing adds 29. If that takes you over 50, wait for a safer hand unless the chart says you are a strong favourite.
• When an opponent is near 50, a quick declare makes everyone add their hand. If they are holding several cards, it may put them out, and in a match you win by being the last player left.

The scoring page has a full worked match.

Read the table, not just your hand

The chart gives you the average case. On the table you have extra clues:

• Card counts. Each opponent shows how many cards they hold. Someone with five or more cards is rarely under 10. Someone with one or two cards could be very low.
• What they took. A player who keeps picking Aces and 2s off the discard pile is building a low hand. Be more careful.
• What they threw. A player who just threw a King or a pair of 9s was carrying heavy cards a moment ago.

For more on reading the table, see the strategy guide. Then try a round and put the chart to work.