[gwnn]

1S-2S
4D-4S

on

Kxx
KQ9x
Jxx
xxx

Apparently the only way that GIB is ever cooperating with is if he has the ace of hearts? Surely 8 working points should be enough to bid 4N or something.

This is probably not easy to fix but generally splinters should not be considered primarily a cue bidding situation but a "do you have a shitload of wastage here" situation. Perhaps in analogy to Fred's rule on splintering opposite 1NT, one could ask "do you still have a single raise if you ignore your points in diamonds?"

Sorry no link.

[gwnn]

And yes I would have got into a terrible slam when I had AQxxx Ax x AKTxx and yes I misbid too (it was indeed a pointless splinter). I reported myself to the authorities.

[johnu]

GIB generally does OK when using Blackwood. Expecting a lot of cooperation in cue bidding/splinter sequences is like expecting meaningful carding by GIB partner when defending. And meaningful carding on defense should be pretty easy since any rules are better than nothing.

[1eyedjack]

In my experience GIB splinters to help human partner, but very seldom makes intelligent use of a splinter made by *it's* partner. A long standing well documented failing and past due for correction.