My definition of strategy is probably different from the OPs, in that I'm a purely discretionary trader who doesn't believe in anything but the most fundamental TA, but I have a trading plan in terms of what instruments I trade, when I trade them, position sizes, maximum losses etc.
I always look for momentum so this morning started by losing a bit of money on jobless claims at 8:30am when ES and ZF both went a bit sideways and stopped me out. I then scanned earnings from the previous close and the morning to prepare a watchlist of strong winners and losers (SNDK, T, EBAY, RS and 2 or 3 others) then waited until market open to see what direction the market was headed and to take the appropriate trade.
Unfortunately I made the right call on SNDK but happened to enter at exactly the wrong time and got stopped out before it headed south in earnest. However I saw the market was lifting strongly and jumped on T for a strong gain before I closed my position very quickly as it turned over on 10am's home sales data. I then held on until 10:30's natural gas inventories data, figuring anything short of a home run would send the contract lower due to the recent run-up, and sure enough I was rewarded with a quick profit although I decided to take profits very early into the first retracement, leaving a lot of money on the table.
At this point I normally keep an eye on my TradeTheNews headlines looking for intraday opportunities on takeover chatter and the like, but the NYSE/NASDAQ internals were so strong that I entered small positions on the ES and ZF and wished later I had gone all in on the ZF as it dropped like a rock until about 3pm. I slapped myself on the wrist as my plan doesn't normally playing "the market" (e.g. ES) intraday and I should have done so on paper before risking real money.
All in all I pumped up my trading account over 6% on the day which is about 10 times my daily goal, but of course earnings season is like shooting fish in a barrel for a momentum/news trader. I've been "winning" in that I've been able to increase my trading capital by a few percent per week average for about 6 months working at it full-time as a relative beginner, and after initial losses and rookie mistakes I've found the secret for me is a) having a plan and sticking to it including what instruments to trade, when to trade them, position sizes and most importantly stop losses, and b) a software platform that automatically sets stops for me when it enters orders, to prevent me from taking large "discretionary losses" (originally NinjaTrader but now ZeroLine Trader).
I don't know if this counts as having a strategy or not, but I'll stick with it until it stops working or I find something better!