tactic trainer hide the solution

I think in tactic trainer it shouldn't be possible to see the solution to a problem.

if a person fails a solution and looks at the solution ...two seconds later the same tactic appears - who cannot solve a tactic in 0:00 if they have just seen the solution.

therefore I suggest that only a limited amount of people can see the solution a 'control group'...

if people can solve a tactic in less than a second it will make the requirement to solve a tactic harder as more people can solve it. even a 1000 rated person can solve a 2000 rated tactic if they have used the right arrow keys to see the solution.

I think a tactic should come up more than 4 times each time you may attempt something new until you got it.