Defendant was tried before a jury, along with a co-defendant, and found guilty of rape. This appeal followed the denial of defendant's motion for new trial. Held: 1. Although defendant's first enumeration of error is somewhat unclear, he appears to complain that the trial court erred in failing to grant a mistrial after certain details of a police officer's trial testimony were revealed to be inconsistent with the officer's testimony at a preliminary hearing. 1 This issue was not preserved for appellate review because defendant failed to assert a motion for mistrial. Tarver v. State, 186 Ga. App. 905, 906 (2) ( 368 SE2d 828). However, assuming the contrary, inconsistencies in the investigating officer's testimony were a matter of credibility for the jury, not a basis for mistrial. OCGA 24-9-80. 2. Defendant's second enumeration of error is not supported by citation of authority or argument in his brief and is thereby deemed abandoned pursuant to Court of Appeals Rule 27 (c) (2). 3. Defendant challenges the sufficiency of the evidence in his final enumeration of error. The victim's testimony that defendant committed acts which constitute the crime charged is sufficient to authorize the jury's finding that defendant is guilty, beyond a reasonable doubt, of rape. Jackson v. Virginia, 443 U. S. 307 (99 SC 2781, 61 LE2d 560); Fields v. State, 216 Ga. App. 184, 187 (3) ( 453 SE2d 794). Dupont K. Cheney, District Attorney, J. Thomas Durden, Jr., Assistant District Attorney, for appellee. | 
