Just One

OK, time for the solution to the coins puzzle from last time.

Not much derivation to do, so I'll just sort of post my solution:

Ask if he knows if one of Porthos or Aramis got at least two gold coins. If Athos got two of the three gold coins, he knows the answer is no. If Athos got no gold coins, then given that all three were given out he knows that the answer is yes. If Athos got one gold coin then he will not be sure.

Of course, you can switch "gold" for "silver" in that solution if you like. Anyway, simple, like I said, but I sort of thought it was neat. I would love to hear any alternate solutions, I haven't thought of any but they probably exist.