diff --git a/.lintstagedrc.yaml b/.lintstagedrc.yaml
index 532c7c4..cc05b94 100644
--- a/.lintstagedrc.yaml
+++ b/.lintstagedrc.yaml
@@ -2,3 +2,4 @@
 '**/*.{ts,tsx,css}':
   - bunx @biomejs/biome lint --write src
   - bunx @biomejs/biome format --write src
+  - bunx @biomejs/biome check --write src
diff --git a/biome.json b/biome.json
index 53d750f..bb76e63 100644
--- a/biome.json
+++ b/biome.json
@@ -19,7 +19,7 @@
     "indentStyle": "space",
     "indentWidth": 2,
     "lineEnding": "lf",
-    "lineWidth": 80
+    "lineWidth": 100
   },
   "javascript": {
     "formatter": {
@@ -39,6 +39,7 @@
   },
   "json": {
     "formatter": {
+      "enabled": true,
       "trailingCommas": "none"
     }
   }
diff --git a/package.json b/package.json
index dda9c18..adbc326 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@tsshogi/kanna",
-  "version": "0.0.4",
+  "version": "0.0.5",
   "description": "棋譜データをパースするライブラリです",
   "author": "tkgstrator",
   "license": "MIT",
diff --git a/src/models/square.dto.ts b/src/models/square.dto.ts
index d8c5dfc..78a94d7 100644
--- a/src/models/square.dto.ts
+++ b/src/models/square.dto.ts
@@ -24,8 +24,9 @@ export const Square = z.preprocess(
         return Piece.OU
       })(),
       color: color === 0 ? Color.BLACK : Color.WHITE,
-      x: x,
-      y: y,
+      // x === 0 || y === 0 のときに強制的に持ち駒に変換する
+      x: y === 0 ? 0 : x,
+      y: x === 0 ? 0 : y,
       is_promoted: is_promoted === 2
     }
   },
diff --git a/src/tests/index.spec.ts b/src/tests/index.spec.ts
index 8c3b87b..5d53a5d 100644
--- a/src/tests/index.spec.ts
+++ b/src/tests/index.spec.ts
@@ -8,7 +8,7 @@ import { importTCSV } from '..'
 describe('math', () => {
   test('parse', () => {
     for (const index of Array.from({ length: 100 }, (_, i) => i)) {
-      if (index === 95 || index === 65 || index === 58) continue
+      if (index === 95 || index === 65) continue
       const query = readFileSync(`src/tests/csv/${index}.txt`, { encoding: 'utf8' })
       const record: Record | Error = importTCSV(query)
       if (record instanceof Error) {