diff --git a/src/variants.ini b/src/variants.ini
index 688cce0d3..f244c1ab0 100644
--- a/src/variants.ini
+++ b/src/variants.ini
@@ -575,6 +575,9 @@ promotionPawnTypes = -
 maxRank = 6
 maxFile = 6
 startFen = 2bnrk/5p/6/6/P5/KRNB2
+promotionPieceTypes = nbr
+promotionRegionWhite = *6
+doubleStep = f
 
 #https://www.chess.com/variants/rookmate
 [rookmate:chess]