Maple Leaf said:
  wide shoulders diminish the reach of the power arm, that is, the power arm is actually further away with a wide shouldered fighter! ÂÂ
I may be in the minority, but find the discussion of reach pretty interesting. Good post Maple Leaf, per usual, but I would have to disagree with your statement above. It also affords me the opportunity to post one of my all-time favorite pics. Rocky Marciano was said to have fairly short arms, but when throwing his right hand he generated lots of power by shifting his hips and torquing his upper torso, maximizing his punching power.  Judging from the photo, it would appear that a fighter having broad shoulders is not put at a disadvantage.  Seems to me his fist would be closer to the target, not further away.ÂÂ
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Hello Bart:
O.K.,I'll try and explain my point of view this way about shoulders and reach:
What I am trying to show here is how wider shoulders actually diminish reach as I stated in an earlier post but did not have the time to explain.
Picture an isoceles triangle made with a man's arms as the two congruent sides and the distance from shoulder to shoulder as the base. Where the two fists meet when the arms are extended is the apex and the middle of the chest is the centre of the base. Now enter some numbers. We can use any numbers but we'll use sigle digit numbers to make it easy. Let the arm length equal 8 and the base (shoulder to shoulder) equal 6. To find the height of this triangle -that is the distance from the centre of the base to the apex- we add the square of a side (8x8=64) with the square of half of the base (3x3=9) and we get 73 which we take the sqare root of and we get 8.5. Therefore, the height of the triangle is 8.5 which is the point of contact if a fighter was standing directly in front of his opponent.
But what happens when the base is made bigger (by wider shoulders)? If we inserted a 7 into the base, but did not legthen the side (the arms) ,and used the same formula, the height would change to 8.7! Therefore, the distance from the centre of the base would be longer and the reach would diminish by 0.2!
Certainly fighters do not stand square to their opponents but reach is calculated before the fight and is just a static number. Reach is considered irrespective to a fighter's style or technique.
From this I have to conclude that arm length is the true measurement of a fighters' reach. However, beware of cheats as measurements can be tricky! If anyone sees this issue completely different I am reading.