No debes engañar durante la partida.

Because Spanish often omits subject pronouns when the verb already makes the subject clear.

Here, debes is the tú form of deber, so a native speaker understands that the subject is you without needing to say tú.

• (Tú) no debes engañar durante la partida.

Adding tú is possible, but it usually gives extra emphasis:

• Tú no debes engañar durante la partida.

That might sound like you specifically should not do it.

This is a very common structure in Spanish:

• no = negation
• debes = you should / you must / you are supposed to
• engañar = infinitive verb

So the pattern is:

• No debes + infinitive

It means something like you should not... or you must not...

Examples:

• No debes correr.
• No debes mentir.
• No debes tocar eso.

The infinitive comes after debes because deber works like a modal verb, similar to should or must in English.

It can suggest either one depending on context.

Deber often expresses:

• obligation
• advice
• moral duty
• rules

So no debes engañar can sound like:

• you should not cheat/deceive
• you must not cheat/deceive

If the sentence is part of game rules, it may feel stronger, closer to must not.
If it is advice, it may feel closer to should not.

Spanish often leaves that strength to context.

Good question. These are related, but not always identical.

• engañar = to deceive, trick, mislead
• hacer trampa = to cheat

In the context of a game, many learners expect hacer trampa, because that is the most direct way to say to cheat in many situations.

So:

• No hagas trampa durante la partida sounds very natural if the idea is specifically don’t cheat in the game.

But engañar can still work if the focus is on deceiving others during play.

So the difference is roughly:

• engañar emphasizes deception
• hacer trampa emphasizes breaking the rules unfairly

Sometimes they overlap, but they are not perfect synonyms.

Because after debes, Spanish normally uses the infinitive.

So:

• debes engañar
• debes estudiar
• debes esperar

This is similar to English:

• you should study
• not you should studies

If you used engañes, that would belong to a different structure, such as a command or subjunctive-based expression:

• No engañes durante la partida. = Don’t cheat/deceive during the game.

That is grammatical, but it is a different sentence type.

Both can tell someone not to do something, but they feel a little different.

• No debes engañar = more like you should not / you must not deceive
• No engañes = direct negative command: don’t deceive / don’t cheat

So:

• No debes engañar sounds more like a rule, principle, or obligation.
• No engañes sounds more direct and immediate.

For example:

• A rulebook or moral instruction might use No debes engañar.
• A person speaking directly to a player might say No engañes.

Durante means during.

It emphasizes that the action should not happen at any point throughout the game/match.

• durante la partida = during the game

You could sometimes hear en la partida, but that usually just means in the game or in the match, and it does not express the idea of throughout the time period as clearly as durante does.

So durante is a very natural choice when talking about something happening over the course of an event.

Partida usually refers to a game, round, or match, especially in contexts like:

• board games
• card games
• chess
• video games in some contexts

It often refers to a specific instance of play.

So la partida is not just the abstract idea of a game; it is more like the actual session/match being played.

Compare:

• juego = game in a broad/general sense
• partida = a particular game/session/match
• partido = usually a sports match

So if this sentence is about cards, chess, or a board game, la partida is very natural.

Yes, depending on what you want to emphasize.

If you specifically mean don’t cheat in the game, many speakers would naturally say:

• No hagas trampa durante la partida.

Other possibilities:

• No se vale hacer trampa. = common, conversational
• No se permite hacer trampa durante la partida. = more formal
• No engañes durante la partida. = direct command

Your original sentence is grammatical, but in everyday game-related language, hacer trampa is often the more expected expression if the idea is specifically cheating rather than general deception.

Yes. Spanish often uses impersonal phrasing for rules.

For example:

• No se debe engañar durante la partida.
• No se permite engañar durante la partida.

These mean something like:

• One must not deceive during the game
• Deceiving during the game is not allowed

This style is common in:

• rules
• signs
• instructions
• official writing

It sounds less personal and more like a general rule for everyone.