Optimal Czech-German border after WW2

[Peterski]

Here I presented my version of optimal Polish borders after WW2:

https://www.theapricity.com/forum/showthread.php?245562-Optimal-Polish-Borders-After-WW2

In case of Czech-German border, the north-eastern part of Sudetenland (within the red frame, CZ) had to become Czech again after WW2, but north-western parts of it (DE) could stay German:

https://i.imgur.com/qYcwCyq.png

https://upload.wikimedia.org/wikipedia/commons/4/41/Sudetenland_Reichsgau_1944.png

^^^
That would make sense especially if we draw the Polish-German border along the Oder and Eastern Neisse (meaning that most of Lower Silesia - bordering on Sudetenland - would stay German):

https://i.imgur.com/TOfzIGr.png

[Peterski]

I have just found information that on 15.09.1938 Edvard Beneš suggested the following solution:

Translated from: http://webcache.googleusercontent.com/search?q=cache:http://dlibra.bg.ajd.czest.pl:8080/Content/1766

"Beneš for the first time suggested the deportation of part of the ethnic German population from Czechoslovakia on 15 September 1938, during the peak of the Sudetenland Crisis. It was then when he handed over to the French his secret plan, according to which he was willing to cede some part of the borderland area - inhabited by 800,000 Germans - to Germany. That area was located outside of the line of Czechoslovak border fortifications. In exchange for giving that border strip to Germany, he expected Germany to agree to take in between 1.5 million and 2 million Germans deported from Czechoslovakia. That plan was the so called 'Fifth Plan', according to Beneš it was a compromise solution - it satisfied both the aspirations of Sudeten Germans to reunite with Germany, and Czechoslovak necessity to preserve a real capacity to defend its borders."

Czech border fortifications in Sudetenland:

https://en.wikipedia.org/wiki/Czechoslovak_border_fortifications

Beneš wanted to keep those fortifications in Czechoslovakia, so he couldn't agree to cede entire Sudetenland to Germany. He wanted to cede one part of that territory, while deporting Germans from the rest.