You can bet below the minimum. there are many examples of questions/answers to be found.
dutching chaser is a very good trigger, but you need to use it only on certain races and also learn the best stop/loss percentage that suits your style.
newbielink:http://community.welldonesoft.com/triggers-for-learning/i've-made-(possibly)-profit-generating-triggers-guess-what-they-do-and-how!/msg18195/#msg18195 [nonactive]
Read the posts.