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====== Advanced Sudoku Techniques ======
===== Lesson 13  There is only one place it can go =====
{{ http://101.6.120.23/~yxue/video/sudoku/sudoku13.mp4 }}
===== Lesson 14. Matching pairs advanced =====
{{ http://rainbow.life.tsinghua.edu.cn/~yxue/video/sudoku/sudoku14.mp4 }}
===== Lesson 15. 3 empty cells in a row within a block =====
{{ http://rainbow.life.tsinghua.edu.cn/~yxue/video/sudoku/sudoku15.mp4 }}
===== Lesson 16. The Walking stick =====
{{ http://rainbow.life.tsinghua.edu.cn/~yxue/video/sudoku/sudoku16.mp4 }}
===== Lesson 17. The Capital T =====
{{ http://rainbow.life.tsinghua.edu.cn/~yxue/video/sudoku/sudoku17.mp4 }}
===== Lesson 18. The amazing 3X3 =====
{{ http://rainbow.life.tsinghua.edu.cn/~yxue/video/sudoku/sudoku18.mp4 }}
===== Lesson 19. Advanced TMB LCR =====
{{ http://rainbow.life.tsinghua.edu.cn/~yxue/video/sudoku/sudoku19.mp4 }}
===== Lesson 20. The cleaver, Mallet Table, and the Diagonal cross  pattern =====
{{ http://rainbow.life.tsinghua.edu.cn/~yxue/video/sudoku/sudoku20.mp4 }}
===== Lesson 21. The Xwing plus scenarios =====
{{ http://rainbow.life.tsinghua.edu.cn/~yxue/video/sudoku/sudoku21.mp4 }}
===== Lesson 22. Review scenarios and the skyscraper pattern =====
{{ http://rainbow.life.tsinghua.edu.cn/~yxue/video/sudoku/sudoku22.mp4 }}
===== Lesson 23. Review. The swordfish pattern =====
{{ http://rainbow.life.tsinghua.edu.cn/~yxue/video/sudoku/sudoku23.mp4 }}
===== Lesson 24. When all else fails #1. Using a matching pair =====
{{ http://rainbow.life.tsinghua.edu.cn/~yxue/video/sudoku/sudoku24.mp4 }}
===== Lesson 25. When all else fails. #2. The underlined pair. =====
{{ http://rainbow.life.tsinghua.edu.cn/~yxue/video/sudoku/sudoku25.mp4 }}
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