From e4383c4234e0c727a1981ca5aa50b09c484d5f6e Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Sun, 30 Aug 2026 13:19:09 +0000
Subject: [PATCH 1/2] Bump the dev-tools group with 4 updates

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest), [pytest-cov](https://github.com/pytest-dev/pytest-cov), [ruff](https://github.com/astral-sh/ruff) and [mypy](https://github.com/python/mypy) to permit the latest version.

Updates `pytest` from 9.0.3 to 9.1.1
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/9.0.3...9.1.1)

Updates `pytest-cov` to 7.1.0
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest-cov/compare/v6.0.0...v7.1.0)

Updates `ruff` from 0.14.4 to 0.16.4
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](https://github.com/astral-sh/ruff/compare/0.14.4...0.16.4)

Updates `mypy` from 1.18.2 to 2.3.1
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](https://github.com/python/mypy/compare/v1.18.2...v2.3.1)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.1.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dev-tools
- dependency-name: pytest-cov
  dependency-version: 7.1.0
  dependency-type: direct:development
  dependency-group: dev-tools
- dependency-name: ruff
  dependency-version: 0.16.4
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dev-tools
- dependency-name: mypy
  dependency-version: 2.3.1
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: dev-tools
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 pyproject.toml | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/pyproject.toml b/pyproject.toml
index 1ecc535..a2e84a0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,10 +25,10 @@ dependencies = ["chess==1.10.0"]
 
 [project.optional-dependencies]
 dev = [
-    "pytest==9.0.3",
-    "pytest-cov>=6",
-    "ruff==0.14.4",
-    "mypy==1.18.2",
+    "pytest==9.1.1",
+    "pytest-cov>=7.1.0",
+    "ruff==0.16.4",
+    "mypy==2.3.1",
     "pre-commit>=3",
 ]
 

From 07579ac141b6330078d8bda62ee9642262c9b641 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 30 Aug 2026 13:29:11 +0000
Subject: [PATCH 2/2] Merge main and fix mypy 2.3.1 optional-buffer errors in
 shared_tt

Co-authored-by: cjunius <41166228+cjunius@users.noreply.github.com>
---
 src/pychess/shared_tt.py | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/src/pychess/shared_tt.py b/src/pychess/shared_tt.py
index abc7a9c..4c5d8a9 100644
--- a/src/pychess/shared_tt.py
+++ b/src/pychess/shared_tt.py
@@ -25,6 +25,14 @@
 _U64 = (1 << 64) - 1
 
 
+def _buffer(shm: shared_memory.SharedMemory) -> memoryview:
+    """Return the segment's buffer, which is ``None`` only once it is closed."""
+    buf = shm.buf
+    if buf is None:  # pragma: no cover - a live segment always has a buffer
+        raise RuntimeError("shared memory segment is closed")
+    return buf
+
+
 def _pack_move(move: chess.Move | None) -> int:
     if move is None:
         return 0
@@ -74,7 +82,7 @@ def probe(
         self, key: int, depth: int, alpha: int, beta: int
     ) -> tuple[bool, int, chess.Move | None]:
         off = (key & self.mask) * ENTRY_SIZE
-        word0, data = _ENTRY.unpack_from(self.shm.buf, off)
+        word0, data = _ENTRY.unpack_from(_buffer(self.shm), off)
         if data == 0 or (word0 ^ data) != key:
             return False, 0, None
         move, score, e_depth, flag = _unpack_data(data)
@@ -89,11 +97,11 @@ def probe(
 
     def store(self, key: int, depth: int, score: int, flag: int, move: chess.Move | None) -> None:
         off = (key & self.mask) * ENTRY_SIZE
-        word0, old = _ENTRY.unpack_from(self.shm.buf, off)
+        word0, old = _ENTRY.unpack_from(_buffer(self.shm), off)
         if old and (word0 ^ old) == key and _unpack_data(old)[2] > depth:
             return  # keep the deeper entry for this position
         data = _pack_data(move, score, depth, flag)
-        _ENTRY.pack_into(self.shm.buf, off, (key ^ data) & _U64, data)
+        _ENTRY.pack_into(_buffer(self.shm), off, (key ^ data) & _U64, data)
 
     def close(self) -> None:
         with contextlib.suppress(Exception):
@@ -110,16 +118,16 @@ class SharedFlag:
     def __init__(self, name: str | None = None, create: bool = True) -> None:
         if create:
             self.shm = shared_memory.SharedMemory(create=True, size=1)
-            self.shm.buf[0] = 0
+            _buffer(self.shm)[0] = 0
         else:
             self.shm = shared_memory.SharedMemory(name=name)
         self.name = self.shm.name
 
     def set(self) -> None:
-        self.shm.buf[0] = 1
+        _buffer(self.shm)[0] = 1
 
     def is_set(self) -> bool:
-        return self.shm.buf[0] != 0
+        return _buffer(self.shm)[0] != 0
 
     def close(self) -> None:
         with contextlib.suppress(Exception):