The group I played with (same as Mark Xu’s group from comment above) decided that “S2 counting is illegal (you have to let your gut ‘feel’ the right amount of time)” and “repeating some elaborate ritual that takes the same amount of time before your card is due is illegal” (e.g. you can stick your hand 10% of the way towards the pile when the number’s 10 off from your card, and 50% of the way when it’s 5 off.)
The group I played with (same as Mark Xu’s group from comment above) decided that “S2 counting is illegal (you have to let your gut ‘feel’ the right amount of time)” and “repeating some elaborate ritual that takes the same amount of time before your card is due is illegal” (e.g. you can stick your hand 10% of the way towards the pile when the number’s 10 off from your card, and 50% of the way when it’s 5 off.)