The result was only a 2-imp gain, because our opponents got to a making 24-hcp 3NT contract. Actually, we had a chance on the opening lead for 8 imps but of course it's hard to underlead an ace! In any case, I do believe that this was the perfect time to pass the support double based on the following considerations:
- The vulnerability was favorable;
- At decision time, it was not yet clear that we would have a game;
- My suit was weak;
- My holding in their suit was good, or at least decent;
- I didn't have much of a fit for partner's suit.
On BBO, my robot partner apparently knows the rules too and when he tried it recently (Sept 2012), it was a huge success.
At every other table but one, the N/S contract was 3NT making an overtrick for 630. At my table, the East robot made an incredibly injudicious bid of 2C over partner's 1S response. My robot knew when he was on to a good thing. This was matchpoints so even down 3 would have got the same result. But we produced a double-dummy defense (and East erred in going up with the king at trick 2) to produce a very nice 100% score of 1400 (13 imps at teams).
As a corollary to this, I also feel that, after a support double has been taken out, all doubles should be for penalties and all new suit bids should be "to play."