diff --git a/src/starfish/internal/game.gleam b/src/starfish/internal/game.gleam
index b616832..a6488df 100644
--- a/src/starfish/internal/game.gleam
+++ b/src/starfish/internal/game.gleam
@@ -464,14 +464,17 @@ fn castling_to_string(castling: Castling) -> String {
 }
 
 pub fn is_insufficient_material(game: Game) -> Bool {
-  {
-    game.black_pieces.pawn_material == 0 && game.white_pieces.pawn_material == 0
-  }
+  game.black_pieces.pawn_material == 0
+  && game.white_pieces.pawn_material == 0
   && {
     game.black_pieces.non_pawn_material == board.bishop_value
     || game.black_pieces.non_pawn_material == board.knight_value
-    || game.white_pieces.non_pawn_material == board.bishop_value
+    || game.black_pieces.non_pawn_material == 0
+  }
+  && {
+    game.white_pieces.non_pawn_material == board.bishop_value
     || game.white_pieces.non_pawn_material == board.knight_value
+    || game.white_pieces.non_pawn_material == 0
   }
 }