Bullish and Bearish Checkmates is a pure concept of price action regarding the real meaning of supply and demand .. simply what we mean by this term is that a potential reversal of the current trend may occur at least for the short term .. 

As a basic trading rules Nothing is 100 % accurate or always right but this is a quick helpful tip for you especially if you trade the short term and like quick profits .. finally don't ever forget that the first rule of trading is that you are Trading Probabilities NOT Certainty ..