Other Curiosities

These are the lowest 3BV's that have been seen in regular playing. The Minesweeper versions currently used for competitive playing don't allow boards with less than 30 3BV for intermediate or 100 3BV for expert, but many years ago the official versions could generate any board. Note that beginner is not included since many people have had one-click boards.

Intermediate Board with 20 3BV (found by Christoph Nikolaus)

Expert Board with 87 3BV (found by Sorin Manea)

This is the highest 3BV on an expert board that has been seen in regular playing. No Minesweeper version limits the highest 3BV that can appear, but boards like this are extremely rare.

Expert Board with 291 3BV (found by Andrey Deviatkin)

This intermediate board has a 3BV of 30, the minimum for competitive playing, but by moving just one mine it changes to an incredibly easy 3BV of 6.

Intermediate Board with 30 3BV Changes to 6 3BV with One Mine Moved