When the initial stages were solved rather quickly and Stages 7, 6 and 8 shortly afterwards were solved during a hectic week, we proceeded to Stage 9. Writing the computer programs for this stage and running them took only about a month. Shortly before we cracked Stage 9, the American Jim Gillogly announced completing Stage 9, so we were not to the first to get this far. Nevertheless, we felt that we were probably among the first ones to solve this stage.
We were now only missing Stages 5 and 10, and started working on them in parallel, hoping to find the solution to Stage 5 some time before we managed to solve Stage 10. At this time, we felt that being the first ones to crack all ten stages was a realistic goal to strive for.