diff --git a/src/modules/reversi/back.ts b/src/modules/reversi/back.ts
index d3769af..69e0574 100644
--- a/src/modules/reversi/back.ts
+++ b/src/modules/reversi/back.ts
@@ -62,7 +62,8 @@ class Session {
 	}
 
 	private get userName(): string {
-		const name = getUserName(this.user);
+		let name = getUserName(this.user);
+		if (name.includes('$') || name.includes('<') || name.includes('*')) name = this.user.username;
 		return `?[${name}](${config.host}/@${this.user.username})${titles.some(x => name.endsWith(x)) ? '' : 'さん'}`;
 	}
 
diff --git a/src/modules/reversi/index.ts b/src/modules/reversi/index.ts
index 5ade998..c5f962b 100644
--- a/src/modules/reversi/index.ts
+++ b/src/modules/reversi/index.ts
@@ -89,10 +89,10 @@ export default class extends Module {
 
 	@bindThis
 	private onReversiGameStart(game: any) {
-		let strength = 5;
+		let strength = 4;
 		const friend = this.ai.lookupFriend(game.user1Id !== this.ai.account.id ? game.user1Id : game.user2Id)!;
 		if (friend != null) {
-			strength = friend.doc.reversiStrength ?? 5;
+			strength = friend.doc.reversiStrength ?? 4;
 			friend.updateReversiStrength(null);
 		}