modify the default value of MAX_MOVE to 3
Merge branch 'master' of https://github.com/qiaoyuguo/practice
Merge branch 'master' of https://github.com/qiaoyuguo/practice
Merge branch 'master' of https://github.com/qiaoyuguo/practice
finish some exercise from book site
Merge branch 'master' of https://github.com/qiaoyuguo/practice