What is interesting and surprising is that good fencers can tell a single millisecond of difference. We have done a lot of testing here with wireless recently and this has brought up some interesting information. In foil for example acceptable contact times for a valid hit are 13 to 15 ms fencers can tell the difference between 13, 14 and 15 ms contact (flick) times and prefer those that are easier to flick with. Further sabreurs (saberists to most of you ;-)) prefer ANYTHING that brings up more lights. If you reduce double time, remove the blocking or do anything that makes doubles more regular then they prefer it. Double time is 120ms +/- 10ms and the difference between 110ms and 130ms is pretty huge. Whipover in sabre has a huge acceptable window as it is 15ms plus or minus 5ms meaning after blade contact blocking of the next hit can be between 10ms and 20ms which is a massive window. If you set sabre up with the double time at its shortest at 110 ms and the blocking period at 20ms making the box its strictest allowable then fencers hate it and practically refuse to use it. Further to this having tested whipover extensively on a range of scoring machines there is very little consistency in terms of how it is implemented meaning that different machines that are supposedly to current rules are not correct. Most fencers (including Olympians!) actually don't seem to understand what whipover is supposed to do and I have had people demonstrate no light after a parry to me as a fault when it is in the rules.