Rule 42 is titled “Chess Clocks”. Rule 42A is titled “Basic requirements” and talks about analog clocks and Rule 42B is titled “Digital clocks” and talks about digital clocks. A better title for 42A would be “Analog clocks”.
Also, rule 42B states:
“Digital clocks with time delay (or Bronstein add back) capability are fully acceptable as tournament equipment. If such clocks are used in competition the providers should, upon request, explain all relevant operational facts to the tournament director and each opponent. Relevant operational facts to be explained include, but are not limited to, the signal at the end of the time control period, any display change from minutes to seconds and any resetting that might occur at the start of a new time control period.”
What about digital clocks with just increment capability or digital clocks without delay or increment capability? Also, the tone of rule makes it seem like digital clocks aren’t widely used. The rule would be improved by simply eliminating the first sentence and a half (it’s already been made clear in the rulebook that digital clocks are preferred over analog clocks so there is no need to state here that “Digital clocks with time delay (or Bronstein add back) capability are fully acceptable as tournament equipment”).
Improved version of rule 42B (I’m sure if could be improved some more but here is a start:
“The providers should, upon request, explain all relevant operational facts to the tournament director and each opponent. Relevant operational facts to be explained include, but are not limited to, the signal at the end of the time control period, any display change from minutes to seconds and any resetting that might occur at the start of a new time control period.”