The best example of a two way course is the Old Course at Saint Andrews, which is still played in the reverse direction on occasion.

 

In this example, an existing defunct 18-hole "executive" length par 60 course is reconfigured with nine greens that can be played at a par of 35 in two different directions.

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Any well designed green will have two or more places where surface drainage exits the green, creating the potential for different approaches and strategies. 

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The direction of play can be changed day to day or an entire 72 player field can be shotgunned and then reversed after completing nine holes.