If you think you have seen closed pawn structures think again. I wanted to compare the pawn structure to Word War I trenches (they were digging in well, that’s why they took so long), however, this was even bigger than “just trenches.” The stalemate in the Korean civil war comes closer. These borders still exist today, no one could cross the mountains in the centre of the country.
In chess, trench war is different. Often the one open file (which the Koreans did not have) decides as was the case here. Watch and see how a closed position like this breaks most chess laws.