Add Nim, Roll-ing to Four

src/variants.ini

@@ -1657,6 +1657,26 @@ pawnTypes = p
 petrifyOnCapture = true
 enPassantRegion = -
 
+#https://en.wikipedia.org/wiki/Nim
+#FSF can be used to analyse Nim. The number of empty squares between the pieces is the number of items in the stack,
+#the number in the custom piece is the number of items you can nim. This is the popular 1-3-5-7 stacks layout.
+[nim]
+maxRank = 9
+maxFile = d
+#if the Nim variant has special rules, ie.nimming<=3 pieces then:
+#customPiece1 = p:mfR3
+customPiece1 = p:mfR
+startFen = 3p/4/2p1/4/1p2/4/p3/4/PPPP
+stalemateValue = loss
+
+#https://www.ludii.games/details.php?keyword=Roll-Ing%20to%20Four
+[roll-ing-to-four]
+maxRank = 10
+maxFile = d
+customPiece1 = p:mfFmfW
+startFen = 1ppp/4/4/4/1PPP/ppp1/4/4/4/PPP1
+connectN = 4
+
 #https://www.ludii.games/details.php?keyword=Quad%20Wrangle
 [quadwrangle:ataxx]
 #different sources give different info on whether it is a 7x7 or 8x8 board.