Avoiding easy losses
{http://adamhgrimes.com/blog/an-easy-way-to-avoid-some-losses/}

Dear SRA, a problem solved? Quindell
{http://ftalphaville.ft.com/2015/04/23/2127341/dear-sra-a-problem-solved/}

Sarao Trader :It smacks of post hoc, ergo propter hoc reasoning
{http://ftalphaville.ft.com/2015/04/22/2127446/executing-trader-sarao/?}

"Attributing the Flash Crash to his activity is also highly problematic. It smacks of post hoc, ergo propter hoc reasoning. Or look at it this way.The complaint alleges that Sarao employed the layering strategy about 250 days, meaning that he caused 250 out of the last one flash crashes. I can see the defense strategy. When the government expert is on the stand, the defense will go through every day. “You claim Sarao used layering on this day, correct?” “Yes.” “There was no Flash Crash on that day, was there?” “No.” Repeating this 250 times will make the causal connection between his trading and Flash Clash seem very problematic, at best. Yes, perhaps the market was unduly vulnerable to dislocation in response to layering on 6 May, 2010, and hence his strategy might have been the straw that broke the camels back, but that is a very, very, very hard case to make given the very complex conditions on that day."

and more on Sarao
{http://www.bloombergview.com/articles/2015-04-21/guy-trading-at-home-caused-the-flash-crash}