This is a renko chart of an actual future contract. It seems that there are about 250 boxes. I see that there are few big consecutive runs: 18 up boxes 23 up boxes Can someone calculate the probability of getting 18 and 23 consecutive runs within 250 tries? My calculations show that if there is 50% chance of getting an up or down box the probability of getting the above is very low. I see such runs very often. This is only one random sample. I say the market is not random. Does this mean that it is not efecient?

Or maybe it's just because you posted a Renko chart that showed an uptrend, and thus had a couple of long consecutive up legs. Trending Renko charts are a hot mess. To see the yin to your chart's yang, see the attachment.