Minidoggy,
Since your original question was seeking an explanation about what you have observed in Olympic Competition, my replies have been mostly an explanation to that end. Although there is sound logic and potential for most of these same skills used in tournaments to be applied in real-life self defense, keep in mind that not ALL "real-life" self defense scenarios are the same, nor do I believe there is a true "standard," "average" or "common" scenario world-wide or nationwide.
I'll come back to your competition questions in a moment, but consider this about what you asked for applying any of this to self defense. I doubt that anyone can give an accurate statement as to what the "average street fight" is going to be like. Realize that if a person spent their entire life at the Yacht-club, the most "common" attack might be a slap in the face. They could defend themselves in ten-thousand fights in their life-time, and never encounter a close range assault with knees and elbows, or a ground-fight.
If one were to spend a lot of time in bars, or pool halls, the most "common" attack might be with a beer bottle, pool cue, or a knife. It depends greatly on your environment, the kind of people you associate with, and what country, state, town, or neighborhood you are in. In one particular town, the most "common" attack might be a "sucker punch" without warning, or a smash over the back of your head with a baseball bat. I have seen enough fights, and participated in enough (through law enforcement, security work, and personal self defense) to know that there is no standard that applies to everyone everywhere. Many variables affect the "type" of assault which might start the fight, and what occurs as the fight progresses. There are many occasions, for real people in real-life self defense, where tournament type sparring is applicable and works just fine. There are other situations where one-step type defense is better, and yet other situations where all-out blood-bath life or death combat is what is required.
My advice is to train in as much variety of tactics as you can, and apply them wisely to each situation as it presents itself. Some people believe in going for blood at the onset of any confrontation (no mercy, take no prisoners, leave no survivors). If that is your mind-set, then go for it! I believe in having that as ONE option. However, I do not believe that the advice
against knowing how and when to apply sparring like skills to the street is entirely correct.
Now, back to your tournament questions. If you are considering competing in a tournament (especially with rules similar to Olympic Taekwondo) then you need to know what the opponent is likely to do and why - - so these are very good questions you are asking. Even if you choose not to fight this way, it is best to learn what has been working at Olympic games and why it works.
I competed as a young Black Belt back in the mid '70's, and the interesting thing is that the most commonly used techniques that worked then, changed by the '80's and again in the '90's. Some things remain consistent, but fighters get smart to the tricks and tactics of other fighters, thus strategy is constantly changing. It often cycles around and the old is brought back again, and surprisingly starts to work all over again.
one more thing fearner, during a part of the sparring where the two are closed in together and attacking, would it be better to bring your guards up while attacking.. since you mentioned the part on distance, i think when they're not attacking, it would be best to keep the guards down then.
The guards down is typically best at a distance, but you only need to be inches outside the opponent's reach - not 5 or 10 feet. If punching to the face is allowed, guards would be best brought up when you close within arms reach, but decide upon your own strategy. Some fighters like to fight close, and will constantly be pushing to reduce the distance. Others prefer the distance and will be best to strike fast and hard while in close (with guards covering your head) then back off or slip out diagonally to increase the range. A fighter who is constantly moving in, must get past the danger zone of your long range strikes (which is not as easily done as it sounds), but then must also encounter a good close range offense (which you must have to offer).
Since the WTF Olympic rules currently do not allow face punches, there is not much concern about keeping the guards up when in close (this can develop a bad habit for real-life so here is one example where classroom training needs to differ). Olympic fighters tend to bump chests when in close, and keep their arms extended low and foward to preven kicks from rising up to the head.
and when you mentioned extending your arm to spoil the kick.. would doing that more often be better than blocking?
From my own personal experience, one way is not absolutely better than the other, but learn to use them both (don't rule out what you are seeing in Olympic matches because others say it doesn't work). I have competed in many tournaments over the years (not strictly Taekwondo). I have been a competitor at State Olympic Taekwondo Games (several Gold Medals), and I have judged, and refereed at state and national JR. and SR. Olympics as well as coached at an International Taekwondo event.
One thing to understand about using your arms in defense is that the length of most people's upper arm (from shoulder to elbow) does not reach to the waist line. Thus, if you bend your elbows to bring your forearms up in a standard, basic guard position, you can not cover your head and your mid-section at the same time. Since attacking above the waist can allow a sidekick, or roundkick at the belt line, the elbow must be dropped, or the forearm lowered to block. This means that the face or head is then open. If you raise to cover the head, the waistline is open.
Now, a person who prefers to keep their guards up and block more often, will have a response as to how to prevent these attacks, but it is still a strategy that
might work, but is not infallible. In my opinion, an
inexperienced fighter should
NOT fight with guards down. However, to say that the guards should
"always" be up, is very limited and narrow in over-all experience and understanding of various applications and strategy.
Minidoggy, since you are primarily asking about tournament strategy, this is one important lesson to learn. A kick to the mid-section can be blocked, but a secondary kick to the next available target happens too fast to react (a point that Bill Wallace has proven time and again). If punches to the face are allowed, a kick mid-section which is blocked will allow a fast hand strike to the head. Ignore the kick to protect your head, and the kick might be very painful.
Each fighter chooses the guarding stance that works best for them, and no particular choice can be held up as the "best." If you choose to leave both guards down, you need to know how to work distance, angles, and body adjustments to spoil attacks rather than block, but blocking is still an option. Some fighters will use a "one guard up and one down" (like Bill Wallace uses - sorry for mentioning his name so much, but he is a well-known example of how this strategy works and not just in TKD/WTF/Olympics). Others use both guards up. Some stand sideways, while others stand straight on facing the opponent.
Personally, I don't like to stay with the same guard postition throughout an entire fight. Changing from both hands up, both down, or one up and one down keeps my opponent from knowing where available targets might be. Furthermore, I'll give you one last hint (or secret, as it were). By lowering my guards, and turning my body at specific angles, I intentionally leave some targets open to my opponent. The only thing is, I know which target is open, thus can better determine how to respond when my opponent goes for that target.
As to how to fight in the street. Think about this example in nature: Two kangaroos fighting each other use similar tactics. Two porcupines fighting each other use similar tactics. However, you might want to approach fighting a kangaroo differently than fighting a porcupine. You have to know who you are, and what you are up against, then apply whatever tactics will work in that situation. Not one strategy works for all situations.
CM D.J. Eisenhart