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GamblingBoy
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Prediction sites are those sites either web based or app based that offers probable outcome of sports matches. There are free and paid versions. Their degree of accuracy depends on which version you subscribe. However, it is found that the paid version has more accurate result than the free one. So if you want to minimize your losses, subscribe to paid one. Apart from this, each of these prediction sites are more effective than one another. For you to know the effective one, you have to look at its winning rate, weekly and monthly. If its winning rate is above 75% then, it is worthable. Also if you are newbie in the field, check reviews from sports forums before you subscribe.