[Carline]

I am sure many players have wondered about this (about 65 year old) question.

Would a rubber with no pimples underneath be acceptable to ITTF ? (I know current rules say no).

I am sure this was tested long ago but never was approved or caught on or whatever.

I have always wondeed how such a rubber would play

But I know for sure that reverse rubbers with shorter pimples underneath are good defensively.

I found TSP New Magnet C (No longer on LARC) & Friendship RITC Tack-Speed 2000 (Still on LARC) ridiculously good for blocking in addition to being good for chopping & have a flat trajectory (low arc). Tack Speed 2000 used to be one of the most popular rubbers in China. I think thse two rubbers have shorter pimples underneath. I suspect 729 Geo Spin Tacky & KTL Pro XT may also be of this design.