Such as the Palestinian concession to endlessly rocket attack civilians or the Palestinian concession to end peace negotiations by firing automatic weapons at Israeli soldiers?
Or the fake Palestinian assertion that only they are indigenous to the land?
Which wonderful concession are you describing?
Keep in mind the Israelis accepted the original partition of Palestine in 1937 and 1948. In 1948 the Arabs rejected it and attacked. 
They lost in war. That is not a concession.