Explanation of Ramban - 1) 6:18 - debate between Rashi, Ibn Ezra and Ramban what the covenant mentioned to Noach is, 2) 9:12 - debate between Rashi/Ibn Ezra vs. Rav Saadia Gaon/Ramban (and other commentators) whether rainbows are a natural occurence or a miraculous event

Explanation of Ramban - 1) 4:17 - did any of Cain's descendants survive the flood, 2) 4:22 - three views in the midrash what was significant about Naamah, 3) 4:23 - debate with Rashi/Ibn Ezra why Lemech's wives separated from him.

Explanation of Ramban - 1:6, 1:8, 1:10 - debate between Rashi/Ibn Ezra vs. Rambam/Ramban whether the Shamayim in verse 1:1 is the spiritual Heavens or the physical Sky

Explanation of Ramban - 20:10, 20:11, 29:10 - debate between Rashi vs. Rambam/Ramban whether Canaanite nations can surrender, and discussion of why the Gibeonites had to lie to surrender and not do so openly? Rambam, Tosafos and Ramban's answers.

Explantion of Ramban - 23:5, 23:7 - debate between Ibn Ezra and Ramban whether Moav gave the Jewish people food and water, and what it means not to offer them peace.

Explanation of Ramban - 15:1 - debate between Rashi, Ibn Ezra and Ramban what 'miketz' means, and when hakhel and cancelling the debts in shemitah happens.

Explanation of Ramban - 10:1 - debate between Rashi, Ibn Ezra and Ramban whether there were one or two arks in the desert.

Explanation of Ramban - 1) 33:2 - debate between Rashi, Rav Saadia Gaon, Ibn Ezra and Ramban where God 'came from' to Mt. Sinai, 2) 33:5 - debate between Rashi, Ibn Ezra and Ramban who is the king of Yeshurun, 3) 33:6 - debate between Rashi, Ibn Ezra and Ramban why the tribe of Shimon is skipped in the blessings, and why the tribes are blessed out of order.