diff --git a/src/Hanafuda/KoiKoi/Game.hs b/src/Hanafuda/KoiKoi/Game.hs
index 7b0b77b..379719d 100644
--- a/src/Hanafuda/KoiKoi/Game.hs
+++ b/src/Hanafuda/KoiKoi/Game.hs
@@ -30,7 +30,7 @@ import qualified Hanafuda.KoiKoi.Yaku as KoiKoi (Score)
 import qualified Hanafuda.Player as Player (ID, Players, Player, Scores, set)
 
 data Mode = FirstAt Int | WholeYear deriving (Show)
-data Move = Play Card | Capture (Card, Card) | Choose Card | KoiKoi Bool
+data Move = Play Card | Capture (Card, Card) | Choose Card | KoiKoi Bool deriving (Show)
 data Step = ToPlay | Turned Card | Scored | Over deriving (Show)
 data Source = Hand | Deck deriving (Show)
 data Action = Action {