Yes, later I was able to find on IMIWA (Kanji dictionary of iOS). It means obstruct, impede, stop, resist, etc… which matches the context on the Go problem I was reading (white invades and black can not stop, etc…) On reading: トウ and kun reading さ (さける）. Jisho has the same information as IMIWA but the entry for parts is empty. Using IMIWA, I could get the kanji by typing the nailbat and the triceratops. 擋 - Jisho.org