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I have seen some replays where terrans will just go 9 or 10 rax into fast OC, with no rush thoughts whatsoever. Yes you have to cut probes but you will get your mule and rax much faster. How much economy do you really sacrifice or do you at all? So I've done a bit of research on the subject.
Map: Kulas Ravine, bottom position.
First I compared both builds as simple as possible (to cut down on interfering factors): no gas at all, only single supply depot, one marine, 1 scv on scout mission and up to 16 scvs mining.
BO's
+ Show Spoiler +9 rax BO:
9 rax
11 supply depot
11 rax building scv - scouting
11 OC (you would have 160 or so minerals once rax gets done)
11 marine
scvs to 18
12 rax BO
10 supply
12 rax
15 stop scvs for some seconds for OC
15 OC
15 marine
scvs to 18
Here are some timings:
-----------------------------9rax/12rax
12th worker was done: 2:51/1:46
16th worker was done: 3:59/3:32
OC finished: 2:33/3:14
Here are amouts of minerals in bank at specific time:
9rax: Minerals/Supply - 12rax Minerals/Supply
2:00: 25M/11S - 40M/14S
3:00: 350M/14S - 270M/16S
4:00: 890M/17S - 870M/18S
5:00: 1675M/18S - 1695M/18S
Conclusions:
1) 9 rax allows for 41 seconds earlier OC which should result in 4 additional mule trips which is 120 minerals. On the other hand u will be on 11 workers untill it finishes.
2) 9 rax results in overall 27 seconds delay in scv production, which is 1,58 scv.
3) As you can see from minerals mined if you stop producing scvs at 18 both builds will neerly brake even. 9 rax was ahead at first because of faster OC but 12 cought up and have ended up slightly ahead because of those 1,58 scvs.
In another test I expanded the limits to taking both gases, making tech lab on rax, scvs to 31 supply.
Basic BO's
+ Show Spoiler +basic 9 rax BO:
9 rax - scouting afterwards
11 supply depot
11 OC (you would have 160 or so minerals once rax gets done)
11 1st gas
11 marine
scvs not stop
tech lab as soon as 25 gas.
2nd gas shortly after 1st is done, no hard timing here, it can be done faster if needed.
basic 12 rax BO
10 supply - scouting afterwards
12 rax
14 1st gas
15 stop scvs for some seconds for OC
15 OC
15 marine
non stop scvs after OC, when money allow 2nd gas
as soon as marine is out - tech lab
* - in reaper build marine is not built and gas is starte on 13
The core timings remained the same:
-----------------------------9rax/12rax
12th worker was done: 2:51/1:46
16th worker was done: 3:59/3:32
OC finished: 2:33/3:14
Added:
-----------------------------9rax/12rax
Tech lab: 3:23/3:29
1st gas finished: 2:40/2:34
2nd gas finished: 3:33/3:49
Resourses and supply:
9rax: Minerals/Gas/Supply - 12rax Minerals/Gas/Supply
3:14: 135M/31G/15S - 60M/43G/17S - time of OC from 12rax build being completed.
4:00: 260M/159G/17S - 280M/143G/19S
5:00: 600M/387G/21S - 670M/371G/23S
6:00: 1125M/619G/24S - 1320M/603G/26S
7:00: 1815M/851G/28S - 2045M/831G/30S
8:00: 2620M1083G/31S - 2930M/1063G/31S
*I took into account units being qued and structures being made or completed when calculating resourses at bank so these numbers are comparable.
Conclusion:
Scvs taken to gas push saturation much further and thus allow for 1,58 spare scvs to kick in much faster. In 4 minutes 12 rax will be already ahead in minerals but slightly behind in gas. In 8 minutes it will be ahead by nearly 300 minerals but with even worker count. On the other hand terrans are already rich in minerals so losing 1 scan in the very long run is not that costy. The point of most economic advantage of 9 rax build is 3:14, after that it starts losing ground. As far as resourses in the begining of the game are more valuable than later on 9 rax build is still economically viable in some situations. For example if you plan to expand really early.
Generally the 9rax build has the following pros/cons:
Pros:
- Gives you early economical advantage as the mule is built faster.
- Gives you early raxes which: makes you imune to any sort of early game rush by the opponent, allows you to bunker rush the opponent, can force opponent to cut eco because of the dange of being rushed (expect some opponents to overreact), screws the opponents timings.
- Gives you 2nd gas much faster.
Cons:
- cuts 1,58 scvs. In 4 minutes you will be economically behind and in 8 will be behind by 300 minerals.
- 1st gas is 6 seconds later.
P.S. On Kulas Ravine with 9 rax build you can have a loaded bunker (1 marine) in the opponents nat in 3:20. With 14 pool the zerg has his lings in his nat at 3:34. I think that 9 rax can be mainstream opening vs zerg and at least viable vs others.
P.P.S.
Reaper timings
+ Show Spoiler +Solid BO: On April 22 2010 00:20 FortuneSyn wrote:
9 rax
11 refinery
OC
11 supply
tech lab
reaper + scvs.
delay putting the 2nd and 3rd scvs in the refinery slightly so u get exactly 50/25 for tech lab.. Fast BO On April 22 2010 03:21 GreggSauce wrote:
the fastest reaper build is
9 barracks
9 refinary
scv
10 supply depot
scvs to gas
scv
tech lab
scv/oc
reaper
The core timings remained the same:
-----------------------------9rax/12rax/9rax-reaper(solid)/9rax-reaper(fast)
16th worker was done: 3:59/3:32/4:04/4:23
OC finished: 2:33/3:14/2:34/3:49
1st gas finished: 2:40/2:34/1:58/1:41
Tech lab: 3:23/3:11/2:47/2:31
Reaper out: -/3:52/3:27/3:14
Solid build: So basicly you get reaper out in 25 seconds faster for 32 seconds (only, compare with standard 9 rax build) delay in scv production = 1,88 scvs.
Fast build: By the time you get your reaper in production (which is 13 seconds faster) you will have a choice: have idle CC and accumulate minerals for OC or build scvs and delay OC. If you delay OC it will be late by 1:15 secs compared to solid build... delay in workers is 51 seconds = 3.00 scvs. If you delay scvs you will be down by 4.2 scvs and OC will be late by 1:01. So basicly you have to kill 3 workers in 12 seconds or solid build is better.
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excellent post, will experiment with 9rax when betakey allows
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Thanks cheerio, this is a great post! I love that even the most basic of openings (rax or depo first, pool or hatch) are still up for debate as to which is more effective in an agressive/eco situation.
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Hmm, that's odd cause according to my findings you will not be ahead in minerals mined at ANY point if you go for OC earlier. Going for Rax so early that you have to cut SCVs to build it (or when waiting for the Depot to finish) will cripple you economically and the earlier OC will not save you. The ONLY way to get an early economical advantage is to delay the OC, not build it earlier.
I do believe earlier rax builds are more viable thanks to the earlier OC gained from it, but it won't be as good as a normally timed or even delayed OC at any point.
Here's a graph of how they fare against eachother (worst one is 6rax): http://pici.se/pictures/fQXxhZuJz.jpg (edit: oops, accidentally cut off the actual values of the y-axis. each level is 500 minerals.)
X-axis time in game seconds, Y-axis total minerals MINED since the start.
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On April 21 2010 21:32 HeyheyLBJ wrote:
The ONLY way to get an early economical advantage is to delay the OC, not build it earlier.
It can't be true. The OC economically is a big scv, if you constantly recast it. It has build time of 35 (twice of scv) and mines at speed 3minerals/second. Scvs mine at speed 0,75minerals per second. 4 times mining speed for 2 times build time and 3 times cost. OC gives eco advantage over scv production, it's a hard fact.
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On April 21 2010 21:46 Cheerio wrote:Show nested quote +On April 21 2010 21:32 HeyheyLBJ wrote:
The ONLY way to get an early economical advantage is to delay the OC, not build it earlier.
It can't be true. The OC economically is a big scv, if you constantly recast it. It has build time of 35 (twice of scv) and mines at speed 3minerals/second. Scvs mine at speed 0,75minerals per second. 4 times mining speed for 2 times build time and 3 times cost. OC gives eco advantage over scv production, it's a hard fact.
Then you should ask yourself why not EVERYONE goes 6 rax instead, since there are no drawbacks.
The truth is that it is possible to cut too many SCV's to get the OC. The Mule is like 4.5 SCV's, but its true strength lies in mining effectively in already saturated bases. Adding a SCV to a mineral line with 16 SCV's in it will be like adding 0.4 SCV's, but the effectiveness of the Mule is unchanged. Saturating your base and then building the OC is not that bad.
All my builds didn't account for the cost of the OC since all of them eventually got it. I also made them when I underestimated the mining rate of SCV's, so the ones who get the OC later should be slightly stronger than what is shown. edit: Not actually that certain though. Won't be any big changes anyway. The trends will be the same.
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On April 21 2010 21:58 HeyheyLBJ wrote:Show nested quote +On April 21 2010 21:46 Cheerio wrote:On April 21 2010 21:32 HeyheyLBJ wrote:
The ONLY way to get an early economical advantage is to delay the OC, not build it earlier.
It can't be true. The OC economically is a big scv, if you constantly recast it. It has build time of 35 (twice of scv) and mines at speed 3minerals/second. Scvs mine at speed 0,75minerals per second. 4 times mining speed for 2 times build time and 3 times cost. OC gives eco advantage over scv production, it's a hard fact. Then you should ask yourself why not EVERYONE goes 6 rax instead, since there are no drawbacks.
There is a huge difference between cutting to get smthing faster and building something instead of something to get it faster. As soon as OC is available it should be made right away, there are no drawbacks. But cutting scvs to get barracks faster and thus OC faster is a drawback. Obvious decision is to have non-stop production on your CC. But obvious is not always best. It would be obvious to build non-stop probes with chronoboost for perfect economy yet a lot of players cut probes for 10 gate in pvz and chronoboost zealots. And terrans even have short term eco benefit for cutting. 9 rax is heavily overlooked in tvz imo.
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Zurich15355 Posts
On April 21 2010 21:32 HeyheyLBJ wrote:
Hmm, that's odd cause according to my findings you will not be ahead in minerals mined at ANY point if you go for OC earlier. Going for Rax so early that you have to cut SCVs to build it (or when waiting for the Depot to finish) will cripple you economically and the earlier OC will not save you.
Why don't you post these findings then? The OP made a pretty clear case for 9rax vs 12rax. If you disagree please present figures that support your point.
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Interesting, thanks for the input !
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It's pretty obvious that a 12 rax is far economically superior to 9 rax as stopped scv production is a hefty longtime economic loss while the earlier OC is only a shorttime gain.
This would be more interesting if you compared a fast reaper build with a normal 12 rax build. Since the reapers give you a indirect advantage by killing their workers you could then see how many workers you would need to kill roughly to have a reaper build be economically better then a non-reaper build.
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It's pretty obvious that a 12 rax is far economically superior to 9 rax as stopped scv production is a hefty longtime economic loss while the earlier OC is only a shorttime gain.
It's a bit more complex than that, see Cheerio's post above:
It can't be true. The OC economically is a big scv, if you constantly recast it. It has build time of 35 (twice of scv) and mines at speed 3minerals/second. Scvs mine at speed 0,75minerals per second. 4 times mining speed for 2 times build time and 3 times cost. OC gives eco advantage over scv production, it's a hard fact.
He's framing this question as "Is it worth cutting back on SCV production so that can get the equivalent of 4SCVs earlier?" Also, the MULE becomes worth more than 4 SCVs once you have more than 1 SCV per patch (since the added benefit for additional SCVs becomes less than linear).
In any case, I am really curious about the question of "If you go 9rax->reaper, how many workers do you have to kill to make it worthwhile?"
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On April 21 2010 22:18 zatic wrote:Show nested quote +On April 21 2010 21:32 HeyheyLBJ wrote:
Hmm, that's odd cause according to my findings you will not be ahead in minerals mined at ANY point if you go for OC earlier. Going for Rax so early that you have to cut SCVs to build it (or when waiting for the Depot to finish) will cripple you economically and the earlier OC will not save you. Why don't you post these findings then? The OP made a pretty clear case for 9rax vs 12rax. If you disagree please present figures that support your point.
I posted a graph of total amounts mined with the different openings.
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On April 21 2010 22:16 Cheerio wrote:Show nested quote +On April 21 2010 21:58 HeyheyLBJ wrote:On April 21 2010 21:46 Cheerio wrote:On April 21 2010 21:32 HeyheyLBJ wrote:
The ONLY way to get an early economical advantage is to delay the OC, not build it earlier.
It can't be true. The OC economically is a big scv, if you constantly recast it. It has build time of 35 (twice of scv) and mines at speed 3minerals/second. Scvs mine at speed 0,75minerals per second. 4 times mining speed for 2 times build time and 3 times cost. OC gives eco advantage over scv production, it's a hard fact. Then you should ask yourself why not EVERYONE goes 6 rax instead, since there are no drawbacks. There is a huge difference between cutting to get smthing faster and building something instead of something to get it faster. As soon as OC is available it should be made right away, there are no drawbacks. But cutting scvs to get barracks faster and thus OC faster is a drawback. Obvious decision is to have non-stop production on your CC. But obvious is not always best. It would be obvious to build non-stop probes with chronoboost for perfect economy yet a lot of players cut probes for 10 gate in pvz and chronoboost zealots. And terrans even have short term eco benefit for cutting. 9 rax is heavily overlooked in tvz imo.
You're building rax instead of depot, which will cut back on your SCV production. Are you saying you can have the same amount of SCV's 9-raxing as you can 10-depoting?
I don't really get what you're saying at all. We're discussing it from an econommical standpoint here and you go talking about chronoboosting zealots...
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On April 21 2010 21:02 Cheerio wrote:
Here are some timings:
-----------------------------9rax/12rax
12th worker was done: 2:51/1:46
16th worker was done: 3:59/3:32
OC finished: 2:33/3:14
Here are amouts of minerals in bank at specific time:
9rax: Minerals/Supply - 12rax Minerals/Supply
2:00: 25M/11S - 40M/14S
3:00: 350M/14S - 270M/16S
4:00: 895M/17S - 870M/18S
5:00: 1675M/18S - 1680M/18S.
sorry, im having a hard time following your data. shouldn't the scv have finished at 3:31 if the oc finished at 3:14 for the 12 rax player, and if the 12th worker was finished for the 9 rax player at 2:51 how did that player create 2 scv's in 9 seconds.
i am probably just greatly misunderstanding something
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On April 21 2010 23:41 Markwerf wrote:
It's pretty obvious that a 12 rax is far economically superior to 9 rax as stopped scv production is a hefty longtime economic loss while the earlier OC is only a shorttime gain.
This would be more interesting if you compared a fast reaper build with a normal 12 rax build. Since the reapers give you a indirect advantage by killing their workers you could then see how many workers you would need to kill roughly to have a reaper build be economically better then a non-reaper build.
What is the solid build order for reaper rush?
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Not taking the Minerals into account 9 Rax is the only SAFE build in TvT without going marauders against reapers. Furthermore i always go 9 Rax, 1 Reaper -> marine->maraud against protoss and the transitioning works perfectly with that.
Vs Z i just fail to win because i have no solid game plan ;/.
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@Cheerio:
Did you come across http://sc2tacop.site90.net/edition1/index.php ?
Click load and import the following:
9rax
9 rax| 0.8.0.14593| terran| un0| un0| un0| bu3| un0| un0| bu1| fl0| fl0| fl22| mo0| fl0| un1| un0| ab0| un0| un0| un0| un0| un0
12rax, I sent the scout at about the same timestamp as it is with 9rax
12 rax| 0.8.0.14593| terran| un0| un0| un0| un0| bu1| un0| fl0| un0| bu3| un0| fl22| un0| un0| fl1| mo0| un1| un0| ab0| un0
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On April 22 2010 00:05 CheeC[h] wrote:Show nested quote +On April 21 2010 21:02 Cheerio wrote:
Here are some timings:
-----------------------------9rax/12rax
12th worker was done: 2:51/1:46
16th worker was done: 3:59/3:32
OC finished: 2:33/3:14
Here are amouts of minerals in bank at specific time:
9rax: Minerals/Supply - 12rax Minerals/Supply
2:00: 25M/11S - 40M/14S
3:00: 350M/14S - 270M/16S
4:00: 895M/17S - 870M/18S
5:00: 1675M/18S - 1680M/18S. sorry, im having a hard time following your data. shouldn't the scv have finished at 3:31 if the oc finished at 3:14 for the 12 rax player, and if the 12th worker was finished for the 9 rax player at 2:51 how did that player create 2 scv's in 9 seconds. i am probably just greatly misunderstanding something
scv was finished not at 3:31 but at 3:32 is that a big difference? 1 sec took me to react and send a mule, only after that I had scv being constructed.
3:00: 350M/14S - 270M/16S
This is not number of scvs, this is supply. 1 supply is marine. The other one is the next SCV being constructed.
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Here is a solid BO for reaper rush:
9 rax
11 refinery
OC
11 supply
tech lab
reaper + scvs.
delay putting the 2nd and 3rd scvs in the refinery slightly so u get exactly 50/25 for tech lab..
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On April 21 2010 23:59 HeyheyLBJ wrote:Show nested quote +On April 21 2010 22:16 Cheerio wrote:On April 21 2010 21:58 HeyheyLBJ wrote:On April 21 2010 21:46 Cheerio wrote:On April 21 2010 21:32 HeyheyLBJ wrote:
The ONLY way to get an early economical advantage is to delay the OC, not build it earlier.
It can't be true. The OC economically is a big scv, if you constantly recast it. It has build time of 35 (twice of scv) and mines at speed 3minerals/second. Scvs mine at speed 0,75minerals per second. 4 times mining speed for 2 times build time and 3 times cost. OC gives eco advantage over scv production, it's a hard fact. Then you should ask yourself why not EVERYONE goes 6 rax instead, since there are no drawbacks. There is a huge difference between cutting to get smthing faster and building something instead of something to get it faster. As soon as OC is available it should be made right away, there are no drawbacks. But cutting scvs to get barracks faster and thus OC faster is a drawback. Obvious decision is to have non-stop production on your CC. But obvious is not always best. It would be obvious to build non-stop probes with chronoboost for perfect economy yet a lot of players cut probes for 10 gate in pvz and chronoboost zealots. And terrans even have short term eco benefit for cutting. 9 rax is heavily overlooked in tvz imo. You're building rax instead of depot, which will cut back on your SCV production. Are you saying you can have the same amount of SCV's 9-raxing as you can 10-depoting? I don't really get what you're saying at all. We're discussing it from an econommical standpoint here and you go talking about chronoboosting zealots...
Yes, economically 12 rax is better. Can we go on now to see the big picture?
P.S. gone testing reaper rush trade-off.
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what's the economic benefits of an early 9 rax -> OC -> fast expand?
might be a diff build alternative to the 1 rax FE.
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On April 22 2010 00:21 Cheerio wrote:Show nested quote +On April 21 2010 23:59 HeyheyLBJ wrote:On April 21 2010 22:16 Cheerio wrote:On April 21 2010 21:58 HeyheyLBJ wrote:On April 21 2010 21:46 Cheerio wrote:On April 21 2010 21:32 HeyheyLBJ wrote:
The ONLY way to get an early economical advantage is to delay the OC, not build it earlier.
It can't be true. The OC economically is a big scv, if you constantly recast it. It has build time of 35 (twice of scv) and mines at speed 3minerals/second. Scvs mine at speed 0,75minerals per second. 4 times mining speed for 2 times build time and 3 times cost. OC gives eco advantage over scv production, it's a hard fact. Then you should ask yourself why not EVERYONE goes 6 rax instead, since there are no drawbacks. There is a huge difference between cutting to get smthing faster and building something instead of something to get it faster. As soon as OC is available it should be made right away, there are no drawbacks. But cutting scvs to get barracks faster and thus OC faster is a drawback. Obvious decision is to have non-stop production on your CC. But obvious is not always best. It would be obvious to build non-stop probes with chronoboost for perfect economy yet a lot of players cut probes for 10 gate in pvz and chronoboost zealots. And terrans even have short term eco benefit for cutting. 9 rax is heavily overlooked in tvz imo. You're building rax instead of depot, which will cut back on your SCV production. Are you saying you can have the same amount of SCV's 9-raxing as you can 10-depoting? I don't really get what you're saying at all. We're discussing it from an econommical standpoint here and you go talking about chronoboosting zealots... Yes, economically 12 rax is better. Can we go on now to see the big picture? P.S. gone testing reaper rush trade-off.
Ok, you have to forgive me for I didn't understand you realized that 12 rax was economically better since you spent the OP and everyone of your replies to me saying it wasn't...
On the other topic: I'd imagine reaper-rushing easily gets the advantage over a non-reaper rushing playing. 9rax is not THAT far behind already thanks to OC, and if you can get a few SCV kills from the early reaper, it's gooood.
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Well-written post...my question is does this affect when you should get OC on your expo?
should you have a certain amount of scvs mining when your maynard before its best to OC...or am i just overthinking the benefit of delaying the OC in exchange for producing scvs.
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At the time you want to be taking your gas in 90% of builds you'll have fewer scvs, which means when you start mining gas it makes a more considerable hit to your economy. If you were opening with a late gas opening (1 rax FE TvP) then perhaps 9 rax might actually be a stronger opening, or at least comparable. Any opening involving a standard gas timing will be stronger with standard 10 depot 12 rax.
I do think rax first openings are quite strong in most circumstances because you have faster access to tech. If you want the best economy though, 10 depot 12 rax 13 gas 15 OC is the best build.
edit: misread a little.
Also, gas timing should be 13 not 14 on depot first.
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10 depot 12 rax in mirror is way too risky in mirror matches imo(prox rines or reaper) and straight up matches without early reaper against P are not fun either^^.
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Updated the OP:
-----------------------------9rax/12rax/9rax-reaper
16th worker was done: 3:59/3:32/4:04
OC finished: 2:33/3:14/2:34
1st gas finished: 2:40/2:34/1:58
Tech lab: 3:23/3:11/2:47
Reaper out: -/3:52/3:27
So basicly you get reaper out in 25 seconds faster for 32 seconds (only, compare with standard 9 rax build) delay in scv production = 1,88 scvs.
But this is a very solid "rush": after the CO is done you can build reapers, scvs and supplies non-stop, actually you may be able to add 2nd rax shortly after. Anyone knows faster variations, but no faster than 9 rax?
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For me its as simple as this. If I'm opening Reaper harass I will 9 rax, if I am opening with a 2 or 3 rax build I will go 12 rax (with a 10 Depot), I usually have enough to lay down rax 2 at 14. One other advantage to a much earlier OC is being able to use a scan earlier (never skip your first mule though).
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On April 22 2010 01:30 Floophead_III wrote:
Also, gas timing should be 13 not 14 on depot first.
On 13 I have to cut scv for some seconds. For the sake of the research (comparison with the best economy possible) I moved it to 14. On the other hand when going reapers it should of course be done at 13, as probably in most other cases.
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nice work man! For useful data, it would be interesting to see what the econ difference is between a 10/12/ opening is vs 9rax-reaper. Given the data you have already collected, it seems the econ hit comes from an earlier gas, not from the earlier rax itself.
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On April 22 2010 01:57 FortuneSyn wrote:
nice work man! For useful data, it would be interesting to see what the econ difference is between a 10/12/ opening is vs 9rax-reaper. Given the data you have already collected, it seems the econ hit comes from an earlier gas, not from the earlier rax itself.
Actually the early gas is a good addition to 9-rax. Coz you start your OC on 11 you can't produce anything and don't need supply depot in near future. So the minerals are better spent on refinary. This is why the cut in scvs is negligble compared to usual 9 rax. And since reapers are gas heavy you don't need minerals that much. It's a well balanced BO, thanks for brining it up. And the eco difference would be hard to estimate by the sheer minerals or gas numbers, it's better be estimated by how much scv's you have cut: 1,88.
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If you are playing versus a zerg player you can always get rushed.. So, the better you get your rax up, the better.. In other games - very playable! Thanks! Great Post!
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I have just tried the 1 rax bunker at 9 and it seems really good..its usefull to get fast expansion..the real problem is if zerg decides to just ignore your bunker and run in your base 
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This matches what my experience has been. 9 rax should not be used for a supposed economic advantage, but it is still a viable option if you're trying to quickly tech up or something where you might sit at 11 supply for an extended period of time in order to have resources for other things. Since the OC can give you resources without requiring any supply, it is an option.
It's also nice, even if you're going for a more normal progression, to be able to get a few marines out quickly to help hold off a 6-7 pool or a reaper rush.
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On April 22 2010 02:34 LuDwig- wrote:I have just tried the 1 rax bunker at 9 and it seems really good..its usefull to get fast expansion..the real problem is if zerg decides to just ignore your bunker and run in your base
If you want 1 rax bunker FE really much try building barracks, supply and bunker at the choke in the way he can't easily run by. But generally 9 rax should be used for offence early on or at least to pretend you are doing so. An interesting idea is to build raxes at the choke and go reapers. Squise as much of it as possible and then add supply or 2 and a bunker at the choke and you should be fine for FE defence.
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the fastest reaper build is
9 barracks
9 refinary
scv
10 supply depot
scvs to gas
scv
tech lab
scv/oc
reaper
sometimes you can get an oc sooner possibly due to better peon splitting but in general your barracks will finish at around 120 minerals which imo makes getting an scv a better option then waiting for oc and tech lab
if you can get a second gas up its possible to effectively mass reapers+ barrakcs, i use this strat quite often, and people haaate it. multiple proxy rax with speed reapers makes everyone angry
also if you 9rax reaper rush off of just one barracks you can expand, bunker up and transition safely to marauders or whatever you like, they wont push out of their base if they know youre still fielding reapers esp if they see 3 of them.
my reaper build should be about 12 seconds faster then the one you described.
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I've done a lot of 10 rax. Difference between 9 rax and 10 rax has to be minimal, you just shift the timing when you get one SCV out by like 10 seconds- same total idle CC time. 12 rax is stronger eco but it means there's like 2 less marines if I do constant production out of the rax from a 10 rax. 10 rax is also safer because those first marines come out so much sooner, and you can start a bunker much sooner(ie. proxy gate)
I make up for the eco loss as much as I can by not sacrificing the early SCV if at all possible. There are less things I have to critically scout for so early with a 10 rax than a 12 rax, I can delay scouting some, or just find their base on a 4 player map, then get out and pressure/scout with marines later instead.
10 rax is a nice way to bunker pressure any slow pooling or ling-skipping FE zerg. Still at plat level, I can win a large number of games with early pressure instead of just straight teching- many players skip or skimp severely on their T1 and leave a lot of idle time on their early gateways or barracks.
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Updated the OP:
The core timings remained the same:
-----------------------------9rax/12rax/9rax-reaper(solid)/9rax-reaper(fast)
16th worker was done: 3:59/3:32/4:04/4:23
OC finished: 2:33/3:14/2:34/3:49
1st gas finished: 2:40/2:34/1:58/1:41
Tech lab: 3:23/3:11/2:47/2:31
Reaper out: -/3:52/3:27/3:14
Fast build: By the time you get your reaper in production (which is 13 seconds faster) you will have a choice: have idle CC and accumulate minerals for OC or build scvs and delay OC. If you delay OC it will be late by 1:15 secs compared to solid build... delay in workers is 51 seconds = 3.00 scvs. If you delay scvs you will be down by 4.2 scvs and OC will be late by 1:01. So basicly you have to kill 3 workers in 12 seconds or solid build is better.
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EPT
