[zaphod]

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Moreover, Sklansky has pointed out that in backgammon checker mistakes cost you little where as cube mistakes cost you a lot

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In a way this is true. Each cube error you make rates to be more expensive than each checker play error that you make(Your 5 biggest cube errors from a match is likly to be bigger than your 5 biggest checker play errors). But you will have many more opportunities to make checker play errors. So in total i think most(all?) people give up more equity from checker play errors than from cube errors.