Benchmark: timing 100000 iterations of KM, Ovid, Shendal, turnstep...
       KM: -1 wallclock secs ( 0.55 usr +  0.00 sys =  0.55 CPU)
     Ovid:  2 wallclock secs ( 2.20 usr +  0.00 sys =  2.20 CPU)
  Shendal:  0 wallclock secs ( 0.53 usr +  0.00 sys =  0.53 CPU)
 turnstep:  1 wallclock secs ( 0.98 usr +  0.00 sys =  0.98 CPU)