diff --git a/src/games/chessbase/brusky-model.js b/src/games/chessbase/brusky-model.js
index 4875b53..6fd7f1a 100644
--- a/src/games/chessbase/brusky-model.js
+++ b/src/games/chessbase/brusky-model.js
@@ -144,9 +144,9 @@
 					return [0];
 				else if(piece.t==3)
 					return [2];
-				else if(piece.t==0 && geometry.R(move.t)==7)
+				else if(piece.t==0 && (move.t in promo[1]))
 					return [4,5,6,7];
-				else if(piece.t==2 && geometry.R(move.t)==0)
+				else if(piece.t==2 && (move.t in promo[-1]))
 					return [4,5,6,7];
 				return [];
 			},
@@ -226,4 +226,4 @@
 		};
 	}
 	
-})();
\ No newline at end of file
+})();