With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: In 1484, Elizabeth of York and her sisters left Westminster Abbey and returned to court when Elizabeth Woodville was apparently reconciled with Richard III. This may or may not suggest that Elizabeth Woodville believed Richard III to be innocent of any possible role in the murder of her two sons (although this is unlikely owing to her involvement in Henry Tudor's failed invasion of October 1483 and her collaboration with his mother, Margaret, in 1485 to bring Richard down once and for all.) It was rumoured that Richard III intended to marry Elizabeth of York because his wife, Anne Neville, was dying and they had no surviving children. The "Crowland Chronicle" claimed that Richard III admitted the truth of this unsavoury rumour, when asked. Soon after Anne Neville's death, Richard III sent Elizabeth away from court to the castle of Sheriff Hutton and opened negotiations with King John II of Portugal to marry his sister, Joan, Princess of Portugal, and to have Elizabeth marry their cousin, the future King Manuel I of Portugal.
text_B: Although Richard III is portrayed in an unflattering light by Shakespeare, does this passage make it sound like the real king was a man of integrity, who would admit to even somewhat-sordid details about his intentions.
YES.