When I issue a takeout double in direct seat, I have tolerance for all unbid suits. Some of my partners, former and current, disagree with it.
I decided a while ago not to say anything about their bidding, they will not listen to me anyway and this teaching/ preaching business is not good, and I will prod along until I have a bad hair day and walk away.
But I overcall as I will, and i will answer to the takeout double as if the partner has the right shape or playing strength.
On the hand below, AJ9xx for me does not qualify as an overcall, the shape is not right for a takeout double, so i passed, but when the opps bid and raised, I balanced in direct seat. Later the partner complained that I did not overcall. The scoring was matchpoints and 5 diamonds was a good sac. But then, who is supposed to bid the 5 diamonds?
Whether I overcalled or balanced, it was still upt to him to bid the 5 diamonds, the overcall and the balanced do not promise any difference in strength.
And speaking of overcalls vs takeout doubles, here the partner had a nice overcall of hearts, but made a takeout double, I did not like the values he had for a takeout double, but at the table I had no way of knowing since we had not agreed to lebensohl, we found a contract in hearts, to a poor score. I remainded silent but hope that the result might teach him not to issue these takeiut doubles anymore.
I might be wring, but I read books and I have never seen anyone teaching such an ugly takeout double.
the bidding went
3diamonds-dbl-4clubs-p-4 hearts, all pass (I could not fit it into the diagram)
and I think in a way, that is one reason why one loses at bridge.

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