makes jump moves required when available

src/main/java/puzzle/JackBoard.java

@@ -97,13 +97,18 @@ public List<Move> getPossibleMoves(int playerColorPiece)
 					while (captures.size() < moves.size()) {
 						captures.add(new ArrayList<Position>());
 					}
-					for(int j = 0; j<moves.size(); j++) {					
+					for(int j = 0; j<moves.size(); j++) {
 						ret.add(new Move( new Position(x, y),moves.get(j), captures.get(j)));
 					}
 				}
 			}
 		}
 
+        if (ret.stream().anyMatch(Move::isJumpMove))
+        {
+            ret.removeIf(move -> !move.isJumpMove());
+        }
+
 		return ret;
 	}