A bearish orderblock is the last up closed candle before a strong move down which gets validated after the candleβs low is closed past. You would then draw it out from the candle open to create your orderblock range.
A bullish orderblock is the last down closed candle before a strong move higher which gets validated after the candleβs high is closed past. Again, you would draw it out from the candle open.
When you have consecutive candles, you can take the entire range (from the open of the first candle) to be your orderblock. This is essentially one large orderblock on the higher timeframe. The left diagram shows a bearish example whilst the right shows a bullish example.
There are two main ways an orderblock becomes high probability: 1) The orderblock is created after mitigating a higher timeframe PD array 2) The orderblock is formed after a liquidity sweep. Making it a protected level