>>228
未解決問題を完全に独自で解決して残念なことはない。
There is nothing disappointing to solve an unsolved problem completely by myself.

残念だ。ということは私に完敗したということでしょうか？
It is regrettable. Does this mean that you have completely been defeated by me?

残念だということにしているこの国は終わり。
This country have been almost over where some people think that i am regrettable.