Is a reasonable probability sufficient to undermine confidence in the outcome?

supra, 466 U.S. at pp. 688, 694.) "A reasonable probability is a probability sufficient to undermine confidence in the outcome." (Id. at p. 694.) " 'Reviewing courts defer to counsel's reasonable tactical decisions in examining a claim of ineffective assistance of counsel [citation], and there is a "strong presumption that counsel's conduct falls within the wide range of reasonable professional assistance." ' [Citation.] '[W]e accord great deference to counsel's tactical decisions' [citation], and we have explained that 'courts should not second-guess reasonable, if difficult, tactical decisions in the harsh light of hindsight' [citation]. 'Tactical errors are generally not deemed reversible, and counsel's decisionmaking must be evaluated in the context of the available facts.' [Citation.]" (People v. Weaver (2001) 26 Cal.4th 876, 925-926.)