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nice wink

You use chrono on warpgates, than depending on what your opponent is doing and your tactic you either go for upgrades, or for a timing push. If you are vs. zerg and you fe, you will use chrono on both nexus. In late game, you use it on all 8-12 warpgates to reinforce your army faster than your opponent

Nice

Dinu you can also use it on warpgates, if you just warped in and need a crucial extra warp in as quick as possible. But if you can afford an extra warp-in real quick after, (and you haven't been 200/200) then it means that you have missed a timing for a warp in (pylon block or just forgot), and basicly you are using chrono to make up for your own fault, when it could have been used on better upgrades or probes. Also if you are racing to 2-2 or 3-3 upgrades make sure you start it as soon as it has finished, or else its kind of a waste to chrono it when you could have been much quicker finished. Its a little like the queens larva inject, you cant miss it, or the larva kapacity overall will drop and you wont be as effecient as you could be.

In an eco build with fe, or just a straight out macro game its very important to chrono boost probes out, but keep an eye on how many there are on each base. You dont want to waste money on oversaturating, because you can only effectively use 2 pr spot. The only time when you oversaturate is if you are planning to ekspand beyond your current number of mining bases, then you can transfer probes and get instant eco boost, when nexus is ready.

Just be careful your opponent isnt doing some kind of timing push, boosting out workers is quite expensive in the beginning and you can be in lack of army power early on.

I feel like Terran is the easiest race to control the economy because you grow the scv supply slowly but at a cost that allows the army to grow along at a steady and consistent growth. Theres no really decision to make, mule is the choice almost everytime. The zerg is prob the hardest, where you have to decide when to drone and when to make and army, the longer you drone the bigger advantage in the end, but at a greater risk. Protoss players suffer from wasting the chrono on early tech to feel safe from early harass or pushes, and then not realizing that the eco isn't where it should be. Terrans mule is scoping in alot of money and zerg can just drone like crazy leaving you behind, and then you can ask your self: Is it worth getting early tech? are the units so much more better that it has paid off?

Ussually you have fewer units in the end, unless ofc it some kind of a rush/timing push you are doing, but with fewer units you have to micro harder. With better eco you can afford to trade units uneven and still come out victorious.

Its all about the economy and the right timing of everything!

first of all 2nd :D
Second i use cronoboost all times through the game to train probes only i don't use that on troops cuz i transform fast into warpgate but chrono on nexus helps u a lot to get a STRONG economy imo

Most effective... hmm equal through all races. If I had to pick it would be protoss, for obvious reasons...

I use chrono's to get early stalkers in P and T. and upgrades in Z.
Its most useful early game id say