[gnasher]

jallerton, on 2015-June-13, 16:15, said:

If LHO has that hand she can still bid 3♠ over your 2♠

Are you saying that

1♣-p-1♦*-1♠
2♣-2♠-3♠

is a splinter?

[Cyberyeti]

jallerton, on 2015-June-13, 16:05, said:

First you said you couldn't remember the auction and asked me what it was. Then when I tell you the auction you don't believe me! Why did I bother?

I didn't remember the exact auction, but I was certain the auction went straight from the 3 level to the 6 level for example.

[jallerton]

Not specifically discussed, but if double of 2♠ is take-out, then 3♠ sounds like a game forcing club raise. Partner may be able to infer the spade length from failure to double and the overcall/raise.

You are right that 2♠ takes away two calls, but in return: (i) Responder gets back one extra positive call (double); (ii) you've told the opponents about the spade fit; (iii) you've told partner about the spade fit so there's a significant possibility that he'll now over-compete the hand. Even worse (iv) in the future on hands where you raise to 2♠ he'll think twice before competing, fearing that you have a completely useless hand like this.