Should generate random number, but rnd() takes >10 min to run.
Mine generation appears random, but is limited by randomness to clock value used for seed
Used set starting seed, each round gives what appears to be random mine locations. However, every so often, only 1 mine will appear
Error was caused by mines being both placed in same grid. Fixed by checking that two mines are present. A functionality achieved, (with exception of initial seed for prand() not actually being random, due to odd behavior of rand()