On the straight pick 3 there are 8 Low-High patterns and also 8 Even-Odd patterns
The chances of guessing one out of eight are of course1/8, but with tracking it might be easier to do.
Anyhow if a person would "pick" one of each for example the HHL and OEE that would give 18 straight pick 3 numbers:
560, 562, 564, 580, 582, 584, 760, 762, 764, 780, 782, 784, 960, 962, 964, 980, 982, 984
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If you would pick 2 of each such as LLL, LHH, EEO and EOO:
Tha makes 75 straight numbers:
013, 021, 023, 031, 041, 043, 057, 059, 065, 067, 069, 075, 079, 085, 087, 089, 095, 097, 201, 203, 213, 231, 241, 243, 257, 259, 265, 267, 269, 275, 279, 285, 287, 289, 295, 297, 401, 403, 413, 421, 423, 431, 457, 459, 465, 467, 469, 475, 479, 485, 487, 489, 495, 497
001, 003, 011, 033, 055, 077, 099, 211, 221, 223, 233, 255, 277, 299, 411, 433, 441, 443, 455, 477, 499
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If you pick 3 and 3 such as LLL LHH HLH and EEO EOO OEE:
That gives 149 straight numbers:
013, 021, 023, 031, 041, 043, 057, 059, 065, 067, 069, 075, 079, 085, 087, 089, 095, 097, 102, 104, 120, 124, 140, 142, 168, 186, 201, 203, 213, 231, 241, 243, 257, 259, 265, 267, 269, 275, 279, 285, 287, 289, 295, 297, 302, 304, 320, 324, 340, 342, 368, 386, 401, 403, 413, 421, 423, 431, 457, 459, 465, 467, 469, 475, 479, 485, 487, 489, 495, 497, 506, 508, 526, 528, 546, 548, 605, 607, 609, 615, 617, 619, 625, 627, 629, 635, 637, 639, 645, 647, 649, 706, 708, 726, 728, 746, 748, 805, 807, 809, 815, 817, 819, 825, 827, 829, 835, 837, 839, 845, 847, 849, 906, 908, 926, 928, 946, 948
001, 003, 011, 033, 055, 077, 099, 100, 122, 144, 166, 188, 211, 221, 223, 233, 255, 277, 299, 300, 322, 344, 366, 388, 411, 433, 441, 443, 455, 477, 499
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That is just a possible sample.
Of course if a person doesn't get the patterns right then that is a lot of money to throw away.
4 and 4 might make 260 straight numbers, it all depends on the combinations of the patterns used how many numbers are given in the outcome.
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Patterns of other filters can be used instead of these and or together with these.
But many people probably have always been right and tracking might be the right way to go.