El peón está en la casilla.

Spanish uses estar for location, so está en la casilla means is in/on the square.

A quick rule of thumb:

• ser = what something is by nature or identity
• estar = where something is, or a temporary state

So:

• El peón es una pieza. = The pawn is a piece.
• El peón está en la casilla. = The pawn is on/in the square.

The accent mark shows where the stress goes: es-TÁ.

It also helps distinguish this form from other possible spellings and is simply part of the correct written form of the verb estar in the él/ella/usted form:

• yo estoy
• tú estás
• él/ella/usted está

So está means he/she/it is or you are (formal), depending on context.

El is the masculine singular definite article, meaning the.

It is used because peón is a masculine singular noun:

• el peón
• el caballo
• el rey

In Spanish, nouns usually need an article more often than in English. So where English might sometimes say Pawn is on the square in a note or label, normal Spanish would usually say El peón está en la casilla.

Because casilla is a feminine noun, so it takes la:

• la casilla
• plural: las casillas

The ending -a often suggests a noun is feminine, and that is true here.

So:

• el peón = the pawn
• la casilla = the square

Here, peón means pawn, the chess piece.

Be aware that peón can also mean a laborer or foot soldier in other contexts, but in a chess sentence like this, it clearly means pawn.

Casilla means square or space on a board, especially in chess and similar games.

It is related in form to casa because -illa is a diminutive ending in Spanish, but you should learn casilla here as its own vocabulary item meaning square/board space.

In chess Spanish, casilla is the normal word for a square on the board.

En is the normal preposition for location in Spanish. It often covers both in and on in English.

So:

• en la casilla can correspond to English on the square
• Spanish does not usually need a separate word like English on here

Other examples:

• Está en la mesa. = It is on the table.
• Está en la caja. = It is in the box.

Spanish en is broader than English in.

In natural English for chess, you would usually say on the square.

But Spanish uses en for this kind of location, so the Spanish structure is the same whether English prefers in or on. The important thing is that en la casilla is the normal Spanish way to express the piece’s position.

A helpful approximation for English speakers is peh-ON.

Break it up like this:

• pe = like peh
• ón = stressed on

The accent tells you the stress is on the last syllable: pe-ÓN.

Also, the e and o are clear Spanish vowels, not reduced like English often does.

In standard Spain Spanish, casilla is roughly kah-SEE-ya.

A few details:

• ca = kah
• si = see
• lla in much of Spain sounds like ya

So the whole word is approximately kah-SEE-ya.

Depending on accent, ll may sound slightly different, but kah-SEE-ya is a good target for most learners.

This is the most neutral Spanish word order:

• subject: El peón
• verb: está
• location: en la casilla

Spanish word order is often similar to English in simple statements. You can sometimes change the order for emphasis, but this version is the most straightforward and natural for a basic sentence.

Normally, no. In standard Spanish, that sounds incomplete or unnatural in a normal sentence.

Spanish usually keeps the definite article with common nouns when talking about a specific thing:

• El peón está en la casilla.

Dropping the article might happen only in special contexts like labels, notes, or very abbreviated game commentary, but it is not the normal full sentence pattern learners should copy.

No. Grammatical gender and biological sex are not the same thing.

In chess, peón is simply a masculine noun, so it takes:

• el peón
• un peón

That does not mean the chess piece is male in any real-world sense. It is just the noun’s grammatical gender.

The plural would be:

Los peones están en las casillas.

Changes:

• el → los
• peón → peones
• está → están
• la → las
• casilla → casillas

So every part that needs to agree changes accordingly.

No. Casilla can also mean a small box, slot, compartment, or square in other contexts, such as forms, grids, or board games.

But in this sentence, the most likely meaning is a chess square because of peón.