In 1991 at the last USSR Championship in rapid chess in Minsk with 70 participants, he shared the 4th to 8th place.

Oleg Krivonosov regularly participated in Latvian Chess Championship, with as most noteworthy results: 3rd place in 1998 and in 2001.

Gathering support from two other participants, Krivonosov claimed that Anna Rudolf, who had been playing very well and had beaten the top seed Christian Bauer, was using a lip balm in her bag as a transmitter to receive the correct moves when she used the bathroom.

The accusations, which were without any material evidence, did not prevent Anna Rudolf from finishing the tournament with a high enough score to obtain her IM and WGM norms.

Krivonosov is considered by many in the Chess community to be a bad sport and used the accusations to upset Anna Rudolf with the intent to reduce her performance to his own advantage.