Instead of just the two intersecting lines (H8), there was a third set of lines,on an angle, intersecting both the other two lines. The boards themselves were sloped. Each player had four pegs to hide, you'd call out locations and the other guy would tell you how many of his pegs he could see from that spot on his board. You'd mark those coordinates with pegs numbered from zero to 4 until you figured out where all of his pieces were hidden.
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