Okay, I looked up in a forum on another site (and forgot to copy the URL, oops!-- but the solution wasn't quite corrrect, anyway...) and here goes:
1- white - right end of right-most chain
2- blue - between blue and white at right end
3- red - beside red at left of 2 blacks at center of same chain
4- red - beside red to right of center blacks of left-hand chain
5- black - fire at blacks of right-hand chain, setting off chain reaction which should join right and left front chains and move them around to the middle
6- black - fire at center blacks that were in the left-hand chain
That's all I can say, because I don't know how to re-do the puzzle to check. But I hope it's enough to help.