Pioche jusqu’à ce que ton coéquipier remporte la partie.

Here, Pioche means Draw! in a game context.

It comes from the verb piocher, which often means:

• to draw a card, tile, token, etc.
• sometimes to pick from a pile

So in a board game or card game, Pioche is a command telling one person to draw from the deck or pile.

Because this is the imperative form, used for commands.

Compare:

• Tu pioches = You draw / you are drawing
• Pioche = Draw!

In French, affirmative commands usually drop the subject pronoun:

• Tu prends → Prends !
• Tu pioches → Pioche !

So Pioche is the normal way to tell someone directly to do it.

In this sentence, it most naturally means keep drawing until...

Even though Pioche is grammatically a single imperative form, the phrase jusqu’à ce que... gives it a continuing sense:

• Pioche jusqu’à ce que... = Draw / Keep drawing until...

So the idea is not just one single draw, but continuing the action up to that point.

Jusqu’à ce que means until.

It introduces a clause describing the point at which the first action stops:

• Pioche jusqu’à ce que ton coéquipier remporte la partie
  = Draw until your teammate wins the game

It is a fixed expression in French, so it is best learned as a whole chunk:

• jusqu’à ce que = until

No. In this expression, ce que does not mean what.

In jusqu’à ce que, the whole phrase works together as a conjunction meaning until. So you should not try to translate each word separately here.

This is one of those French structures that is easiest to learn as a set phrase:

• avant que = before
• pour que = so that
• jusqu’à ce que = until

Because jusqu’à ce que normally requires the subjunctive in French.

So the sentence uses the subjunctive of remporter:

• jusqu’à ce que ton coéquipier remporte la partie

Why the subjunctive? Because the winning is seen as something not yet realized at the moment of speaking.

A useful thing to know: in this case, remporte looks the same as the present indicative form. So the form itself does not visibly change, but the grammar still calls for the subjunctive.

You can see the difference more clearly with another subject:

• jusqu’à ce que nous remportions la partie
  Here remportions clearly shows the subjunctive.

Ton coéquipier means your teammate.

Breakdown:

• ton = your for one person you address with tu
• coéquipier = teammate

A few useful related forms:

• ton coéquipier = your teammate (male / masculine noun)
• ta coéquipière = your teammate (female)
• votre coéquipier / votre coéquipière = your teammate in formal or plural you

So this sentence is addressed to one person informally.

Remporter la partie means to win the game / match / round.

The verb remporter is a common way to say win in formal or game-related contexts. It is very close to gagner here.

So both of these are possible:

• remporter la partie
• gagner la partie

Remporter can sound a little more idiomatic or slightly more elevated, but both are correct.

Here, la partie means the game, in the sense of a match, round, or play session.

French often distinguishes:

• le jeu = the game as a game, system, or object
• la partie = a particular round or session of play

So:

• remporter la partie = win the game/match
• aimer ce jeu = like this game

In this sentence, la partie is the natural choice because it refers to the actual contest being played.

Because jusque becomes jusqu’ before à.

So instead of jusque à, French uses:

• jusqu’à

This is just the normal written form. It helps the phrase flow more smoothly in pronunciation.

So:

• jusqu’à = correct
• jusque à = not standard here