This page contains a number of Zertz problems I've put together for those who want to practice spotting basic Zertz moves. Each problem, except the very simplest, contains a link to a related but simpler problem. If you get stuck, have a look at the simpler problem, and see if that can give you some inspiration.
1. Capture a white stone at the cost of a black stone.
2. Capture a grey stone at the cost of a white stone.
3. Capture a white stone without giving up any stones.
4. Capture a white stone at the cost of a black stone.
5. Capture a black stone at the cost of a white stone.
6. Capture a white stone at the cost of a black stone.
7. Capture a grey stone without losing another stone.
8. Capture a white stone at the cost of a black stone.
9. Capture a white stone at the cost of a grey stone.
10. Capture a grey stone at the cost of a black stone.
11. Capture a white stone at the cost of a black stone.
12. Capture a white stone at the cost of a black stone.
13. Capture a white stone at the cost of a black stone.
14. Capture a grey stone at the cost of a black stone.
15. Capture a white stone at the cost of two grey stones.
16. Capture a white stone at the cost of a black stone.
17. Capture a grey stone at the cost of a black stone.
18. Capture a white stone at the cost of a black stone.
19. Capture a white stone at the cost of a black stone.
20. Capture a white stone at the cost of a black stone.
21. Capture a two white stones at the cost of a black stone. (Simpler Problem - 17)
22. Capture a white stone at the cost of a black stone. (Simpler Problem - 14)
23. Capture a white stone at the cost of a grey stone. (Simpler Problem - 7)
24. Capture a black stone at the cost of a white stone. (Simpler Problem - 17)
25. Capture a black stone at the cost of a white stone. (Simpler Problem - 5)
26. Capture a white stone at the cost of a black stone. (Simpler Problem - 19)
27. Capture two white stones at the cost of a black stone. (Simpler Problem - 14)
28. Capture a grey and a white stone at the cost of a black stone. (Simpler Problem - 10)
29. Capture a grey stone at the cost of a white stone. (Simpler Problem - 2)
30. Capture a white stone at the cost of two grey stones. (Simpler Problem - 15)
31. Capture a two grey stones at the cost of a black stone. (Simpler Problem - 17)
32. Capture two white stone without giving up any stones. (Simpler Problem - 3)
33. Capture a white stone at the cost of a black stone. (Simpler Problem - 6)
34. Capture a white stone at the cost of two black stones. (Simpler Problem - 18)
35. Capture a black stone at the cost of two white stones. (Simpler Problem - 5)
36. Capture a white stone at the cost of a grey stone. (Simpler Problem - 9)
37. Capture a grey stone at the cost of two black stones. (Simpler Problem - 14)
38. Capture a grey stone at the cost of two black stones. (Simpler Problem - 17)
39. Capture two white stones at the cost of two grey stones. (Simpler Problem - 15)
40. Capture a white stone at the cost of a grey stone. (Simpler Problem - 9)
41. Capture two grey stones without losing another stone. (Simpler Problem - 7)
42. Capture two white stones at the cost of a black stone. (Simpler Problem - 4)
43. Capture a grey stone at the cost of a black stone. (Simpler Problem - 7)
44. Capture a white stone at the cost of two black stones. (Simpler Problem - 19)
45. Capture a white stone at the cost of two black stones. (Simpler Problem - 18)
46. Capture a white stone at the cost of two black stones. (Simpler Problem - 4)
47. Capture two grey stones at the cost of a black stone. (Simpler Problem - 10)
48. Capture a white stone at the cost of a black stone. (Simpler Problem - 18)
49. Capture a white stone and a black stone at the cost of a black stone. (Simpler Problem - 16)
50. Capture two grey stones at the cost of two black stones. (Simpler Problem - 47)
51. Capture two grey stones at the cost of a black stone. (Simpler Problem - 47)
52. Capture a white stone at the cost of two black stones. (Simpler Problem - 48)
53. Capture two grey stones at the cost of two black stone. (Simpler Problem - 47)
54. Capture two grey stones and a black stone at the cost of a black stone. (Simpler Problem - 48)
55. Capture two white stones at the cost of two black stones. (Simpler Problem - 46)
56. Capture a white stone at the cost of two grey stones. (Simpler Problem - 36)
57. Capture a white stone at the cost of two black stones. (Simpler Problem - 44)
58. Capture a black stone at the cost of a two white stones. (Simpler Problem - 24)
59. Capture two grey stones at the cost of a black stone. (Simpler Problem - 41)
60. Capture two grey stones at the cost of a black stone and a grey stone. (Simpler Problem - 47)
61. Capture a white stone at the cost of two black stones. (Simpler Problem - 22)
62. Capture a white stone at the cost of two black stones. (Simpler Problem - 45)
63. Capture a white stone at the cost of three black stones. (Simpler Problem - 45)
64. Capture a white stone at the cost of two black stones. (Simpler Problem - 26)
65. Capture two grey stones at the cost of a black stone and a white stone. (Simpler Problem - 47)
66. Capture a white stone at the cost of three black stones. (Simpler Problem - 44)
67. Capture a black stone at the cost of two white stones. (Simpler Problem - 25)
68. Capture two grey stones at the cost of one grey stone. (Simpler Problem - 41)
69. Capture a white stone at the cost of two grey stones. (Simpler Problem - 23)
70. Capture two white stones at the cost of two black stones. (Simpler Problem - 45)
71. Capture three grey stones at the cost of three black stones. (Simpler Problem - 41)
72. Capture two white stone at the cost of three black stones. (Simpler Problem - 46)
73. Capture two grey stones at the cost of two black stones. (Simpler Problem - 34)
74. Capture a white stone at the cost of three black stones. (Simpler Problem - 34)
75. Capture three grey stones at the cost of two black stones. (Simpler Problem - 47)
76. Capture two white stone at the cost of three grey stones. (Simpler Problem - 30)
77. Capture a white stone at the cost of three black stone. (Simpler Problem - 34)
78. Capture two white stones at the cost of two black stones. (Simpler Problem - 33)
79. Capture two grey stones at the cost of two grey stones. (Simpler Problem - 41)
80. Capture two white stones at the cost of four grey stones. (Simpler Problem - 76)
81. Capture two grey stones at the cost of two black stones. (Simpler Problem - 59)
82. Capture two white stones at the cost of three black stones. (Simpler Problem - 78)
83. Capture two grey stones at the cost of a black stone and a white stone. (Simpler Problem - 47)
84. Capture two grey stones at the cost of two black stones. (Simpler Problem - 59)
85. Capture two grey stones at the cost of three black stones. (Simpler Problem - 73)
86. Capture a white stone at the cost of three black stones. (Simpler Problem - 74)
87. Capture two grey stones at the cost of four black stone. (Simpler Problem - 53)
88. Capture two grey stones at the cost of two black stones. (Simpler Problem - 79)
89. Capture two grey stones at the cost of a black stone and a grey stone. (Simpler Problem - 60)
90. Capture a white stone at the cost of three black stones. (Simpler Problem - 66)
91. Find three ways of capturing two grey stones at the cost of two black stone. (Simpler Problem - 53)
92. Capture a white stone at the cost of two black stones. (Simpler Problem - 77)
93. Capture a white stone at the cost of three black stones. (Simpler Problem - 63)
94. Capture a white stone at the cost of three black stones. (Simpler Problem - 63)
95. Capture a white stone at the cost of two black stones. (Simpler Problem - 66)
96. Capture three grey stones at the cost of five black stones. (Simpler Problem - 71)
97. Capture two grey stones at the cost of one grey stone. (Simpler Problem - 68)
98. Capture two white stones at the cost of three black stones. (Simpler Problem - 70)
99. Capture two white stones at the cost of two grey stones. (Simpler Problem - 78)
100. Capture two white stones at the cost of four black stones. (Simpler Problem - 82)
If you can't solve any of these, feel free to email me - I may well have made a mistake when making them.