After some time I realised that the LTC/BTC exchange rate is quite constant. Probably due to some automatic arbitrage going on like USD -> BTC -> LTC -> USD. The conclusion is that the LTC exchange rate must follow the BTC trend very quickly. This knowladge combined with the sudden down fall of BTC last week made it for me. But as I mentioned before. This strategy did not work out after all. And it was not more than about 10 wins in a row. Wich might be just plain luck.