![]() Players who enjoy flagging often make the mistake of guessing mines when it is equally important to open safe squares. The sixth strategy is to calculate probability. This is the best strategy for winning games but can be complicated and time consuming. Local probability is easy to calculate but global probability is much more difficult. ![]() For example, it is easy to calculate that one mine in two squares is 50:50 but what if probability depends on all possible mine arrangements for the rest of the board? Sean Barrett has written an excellent guide to Minesweeper Advanced Tactics. The following example considers all six strategies. The first strategy is to guess quickly and hope for the best. This approach will give the best score if you survive. The second strategy is solving the rest of the board to determine the number of mines remaining. There are 79 possible mine arrangements but only 1 solution has 9 mines. The third strategy opens a safe square but in this case there are none. The fourth strategy makes a useful guess. In this case there is one square (I) that solves the board if it is a 4 or 7. The fifth strategy guesses a square that does not touch a number (B, C, F, G) hoping Expert density of 0.206 comes to the rescue. The sixth strategy calculates global probability which ranges from 0.392 (D, K) to 0.798 (J). ![]() Minesweeper is won by opening all safe squares. On Intermediate a NF player needs to open 216 safe squares but an inefficient Flagger also needs to flag 40 mines. However, remember that chording can open multiple squares. NF players look for openings instead of mines. Openings propagate in all directions until they are surrounded by numbers.
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