With main markets showing gains of up to 30% since the post-11 September slump, most sellers were happy to pocket gains and wait for some stronger signals of revival. The collapse of a rescue bid for the US energy trader Enron, which rendered its shares virtually worthless in New York yesterday, hit the stocks of Japanese companies exposed to the group, dragging the Nikkei 225 Average down, although it recovered to close 31.15 points up at 10,655.96.