Some idea for simpler captcha. Now most service is provided by two stage image recognition. 2 stages are tricky for a bot, but if a bot can solve 100% of first stage, it can probably solve 70% of second stage and win it; if 40% at 1st stage then 20% at second, for example, it loose. 2 stages are absolutely redundant for human beings: if 1st stage is 80 it could 50 in second and user is prized anyway. So it could be better to prize highest score users: if you got 100% in at least 2 stages then third is only 1 stage.
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