diff --git a/Makefile b/Makefile
index e607452..53446e9 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@ clean:
 	${SBT} clean
 
 bench: clean
-	${SBT} mogCoreJVM/test:run mogCoreJS/test:run
+	${SBT} mogCoreJVM/test:run 'set scalaJSStage in Global := FullOptStage' mogCoreJS/test:run
 
 .PHONY: build test console clean bench
 
diff --git a/shared/src/main/scala/com/mogproject/mogami/core/Player.scala b/shared/src/main/scala/com/mogproject/mogami/core/Player.scala
index b49ff32..0fecfe7 100644
--- a/shared/src/main/scala/com/mogproject/mogami/core/Player.scala
+++ b/shared/src/main/scala/com/mogproject/mogami/core/Player.scala
@@ -15,6 +15,8 @@ sealed abstract class Player(val id: Int) extends CsaLike with SfenLike{
   override def toCsaString: String = Player.csaTable(id)
 
   override def toSfenString: String = Player.sfenTable(id)
+
+  def toSymbolString: String = Player.symbolTable(id)
 }
 
 object Player extends CsaTableFactory[Player] with SfenTableFactory[Player] {
@@ -24,6 +26,8 @@ object Player extends CsaTableFactory[Player] with SfenTableFactory[Player] {
 
   override val sfenTable: Seq[String] = Seq("b", "w")
 
+  val symbolTable = Seq("☗", "☖")
+
   val constructor: Seq[Player] = Seq(BLACK, WHITE)
 
   def apply(id: Int): Player = {
diff --git a/shared/src/test/scala/com/mogproject/mogami/core/PlayerSpec.scala b/shared/src/test/scala/com/mogproject/mogami/core/PlayerSpec.scala
index 8c9f7c3..4f47538 100644
--- a/shared/src/test/scala/com/mogproject/mogami/core/PlayerSpec.scala
+++ b/shared/src/test/scala/com/mogproject/mogami/core/PlayerSpec.scala
@@ -28,6 +28,11 @@ class PlayerSpec extends FlatSpec with MustMatchers with GeneratorDrivenProperty
     WHITE.toSfenString must be("w")
   }
 
+  "Player#toSymbolString" must "describe unicode characters" in {
+    BLACK.toSymbolString must be("☗")
+    WHITE.toSymbolString must be("☖")
+  }
+
   "Player#parseCsaString" must "make player" in {
     Player.parseCsaString("+") must be(Some(BLACK))
     Player.parseCsaString("-") must be(Some(WHITE))