Quick Alpha Group

It was told that nifty given some 11+ return over 10 years and Momentum investing gave 15+ return over same period. but i was wondering if you have taken nifty and forgot for 10 years then post that only ltcg on gains but for this there must be STCG in various 6 months shuffle which cost was not included while they have considered so intrictae details for backtesting. am i missing something.