Middlegame Novelty?

Cranking my way through games in old Chess Informants, I thought that one particular game seemed familiar. Indeed, Psakhis -- Pomes, Groningen 1990 (CI 50/304) followed Huebner -- Nogueiras, Barcelona 1989 (CI 47/343) until move 23.

White to move

Psakhis played 23.Rb6!

Huebner had played 23.c3 and Nogueras found a stalemate resource at move 41.

Black to move

Heubner avoided the stalemate, but the game was agreed drawn five move later.