Is the failure to fulfill the fourth vow, after unconsciously playing with it, considered in addition to the ruling of the first three vows to leave the game for a specified period (after testing)?

Your statement, "Indeed, you will not do it," is not a vow unless you intended "I make a vow upon myself if I do it." The mentioned vow is a vow of obstinacy and anger, and it necessitates an expiation for breaking an oath when violated. This expiation is feeding ten poor persons, or clothing them, or freeing a slave. If you are unable to do that, then it is fasting for three days. If the vow is ambiguous, its expiation is the expiation for an oath. You are obligated to perform one expiation for an oath for all the times you violated it, if you have not expiated before. If you have expiated for one of them, then you owe an expiation for each subsequent oath. Violating an oath forgetfully does not necessitate an expiation according to us, but it is more cautious.