HmJ_JP said:
I often like these tactics, work well in HOI4 although AI gets suspicious when the opening is too narrow. But don't try the opposite in 1939 against Germany, it doesn't fare well until you're well equipped.
I did it by accident one time in an MP game many years ago.
The weird way some tiles near Kherson are drawn, one time I left one tile completely uncovered along the river. The Italian player sent some motorized troops through the gap, and I didn't notice at first. When I noticed a weird Italian snake heading towards Sevastopol, I panicked for two seconds thinking I had divisions that were outright overrun. Then I realized it was just a tile that wasn't covered with no actual divisions lost. I called in the operational armored reserve and cut off around 15 divisions.
It wasn't 5 dimensional chess, but it looked like it to the Axis.