Here are some examples of Richard III's deviousness in the play:
1) Plotting to Frame Others: Richard falsely accuses his brother Clarence of treason and has him executed, securing Clarence's lands and titles for himself.
2) Betraying Allegiance: Richard pretends to support the rightful heir, Edward, Prince of Wales, but later betrays him and his brother in the Tower of London, eventually killing them.
3) Marrying Anne Neville: To strengthen his claim to the throne, Richard marries Anne Neville, the widow of Edward, Prince of Wales, despite previously slandering her and her family.
4) Wooing Lady Anne: Richard successfully manipulates Lady Anne, whose husband he has killed, into agreeing to marry him by playing on her grief and vulnerability.
5) Eliminating Potential Threats: Richard orders the deaths of his nephews, the Princes in the Tower, to remove potential rivals to the throne.
6) Fabricating Evidence: Richard plants false evidence implicating Buckingham and Hastings, two of his own supporters, in a conspiracy against him to justify their executions.
Throughout the play, Richard III's deviousness is a key aspect of his character, contributing to his villainy and ultimately leading to his downfall and tragic end.