I declared this contract in a recent ACBL speedball. At favourable vulnerability and rather than allow the opponents room to manoeuvre my leapt straight to 5♥ which after being doubled, ended the auction.
When dummy came down, I saw it was a very marginal sacrifice, and whether it would score well depended on how the ♣ and ♥ suits broke. The opponents took the ♠ Ace and I trumped the ♠ continuation. At this point, as far as I recall, I drew trump (which split 2-2), played a top ♣ honour and the queen dropped on my right.
Now I had a think. Ordinarily the percentage play, by restricted choice, would be to finesse the other opponent for the other honour. However, I reasoned thusly: If there was indeed a 3-1 break in either ♣ or ♥ then the opponents' ♠ game would have made meaning our sacrifice was a good one, trading at worst -300 for -620. However, if both suits broke 2-2 then the opps had no major game since we would have 4 top tricks. If this was the case then I had to make my contract to be in with the hope of a good score.
I therefore cashed the AK♣. As it happened ♣ and ♥ did break 2-2, with a QJ doubleton in ♣ and my decision was vindicated on this deal. Was it sound logic? And if so does this scoring coup have a name? I've never read about it nor heard anyone discuss it on the Vugraph, which makes me think I may have missed something.