diff --git a/backend/api/routers/tournaments.py b/backend/api/routers/tournaments.py
index 5b8467d..545b0b7 100644
--- a/backend/api/routers/tournaments.py
+++ b/backend/api/routers/tournaments.py
@@ -1,15 +1,64 @@
 from fastapi import APIRouter, Depends, HTTPException, status
-from sqlalchemy import func, select
+from sqlalchemy import and_, case, func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from api.deps import get_current_superuser
-from database.models import Seat, Tournament, User
+from database.models import Seat, Ticket, TicketStatus, Tournament, User
 from database.session import get_db
-from schemas.tournament import SeatGenerateRequest, TournamentCreate, TournamentResponse
+from schemas.tournament import SeatGenerateRequest, SeatResponse, TournamentCreate, TournamentResponse
 
 router = APIRouter(prefix="/api/tournaments", tags=["tournaments"])
 
 
+@router.get("/{tournament_id}/seats", response_model=list[SeatResponse])
+async def get_tournament_seats(
+    tournament_id: int,
+    db: AsyncSession = Depends(get_db),
+) -> list[SeatResponse]:
+    """
+    Публичный эндпоинт. Возвращает все места турнира с флагом is_available.
+
+    Место недоступно (is_available=False), если связанный Ticket
+    находится в статусе LOCKED или PAID.
+    Используется LEFT OUTER JOIN + CASE для вычисления флага одним запросом.
+    """
+    # 1. Вычисляем is_available через CASE на стороне БД
+    is_available_expr = case(
+        (
+            and_(
+                Ticket.id.is_not(None),
+                Ticket.status.in_([TicketStatus.LOCKED, TicketStatus.PAID]),
+            ),
+            False,
+        ),
+        else_=True,
+    ).label("is_available")
+
+    # 2. LEFT JOIN: берём все места турнира, присоединяем Ticket (если есть)
+    stmt = (
+        select(Seat, is_available_expr)
+        .outerjoin(Ticket, Ticket.seat_id == Seat.id)
+        .where(Seat.tournament_id == tournament_id)
+        .order_by(Seat.sector, Seat.row, Seat.number)
+    )
+
+    # 3. Выполняем запрос и формируем ответ
+    result = await db.execute(stmt)
+    rows = result.all()
+
+    return [
+        SeatResponse(
+            id=seat.id,
+            sector=seat.sector,
+            row=seat.row,
+            number=seat.number,
+            price=seat.price,
+            is_available=bool(is_available),
+        )
+        for seat, is_available in rows
+    ]
+
+
 @router.post("", response_model=TournamentResponse, status_code=status.HTTP_201_CREATED)
 async def create_tournament(
     body: TournamentCreate,
diff --git a/backend/schemas/tournament.py b/backend/schemas/tournament.py
index 317aab5..fba56f2 100644
--- a/backend/schemas/tournament.py
+++ b/backend/schemas/tournament.py
@@ -34,3 +34,12 @@ class TournamentResponse(BaseModel):
     event_date: datetime
 
     model_config = ConfigDict(from_attributes=True)
+
+
+class SeatResponse(BaseModel):
+    id: int
+    sector: str
+    row: int
+    number: int
+    price: int
+    is_available: bool