question about observation

[Seattleallstar]

in all the time I have been watching horse racing, I never get why a horse who seemingly has run shoot down on the inside and they cant keep going or accelerate through, rarely have I seen a horse with run go on the inside and just zoom on through. But yet it it would seem a very smart and logical move taking the shortest path, but yet horses that pass from outside wins much more frequently. Can someone educate me please