Don/other experts, How to find covariance of a game ?

[Norm]

My question : Is simulations the only way to find total variance of N hands per round ?

For a counting strategy cut card game, yes.

[aceside]

For a counting strategy cut card game, yes.

I speculate that this simulation may need a massive computation power because covariance is the product of two variances. This means a squared amount of computations.