is the number of beats per minute and is the same as your pulse ... This will give the correct formula. If you want SV, cover SV with your finger and you are left with CO/HR.

Locations include wrist, neck and upper arm. The pulse rate is expressed in beats per minute. To measure your pulse rate, count the number of beats in a set period of time, eg 30 seconds ...

This introduction that has now been in place for sometime could well give that additional flavour for the chess players as ...