As a part of Renzo Gracie “Mastering Brazilian Jiu-Jitsu” online course, Renzo shows some game changing adjustments for the Katagatame. He calls it the KatagaRenzo.
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Important points that Renzo stresses in his version are hand placement, putting pressure, and not putting your weight low.
Here is Renzo Gracie demonstrating the technique on Demian Maia: