What happens if you do put it in?

I think one of them won't build, the other will, and I believe it's random as to which build goes through. At least one of the builds will be delayed till the next build turn, maybe both.

I beg to differ. Of course you can "build a unit on the North Coast of a SC, while building a unit on the South Coast of a SC," as long as they are two different countries. :-)

In a normal diplomacy game you can't as the only person who has a home SC with coasts is Russia and they only have one.

i'm not sure how it fails. You either get one order taking precedence, or both orders fail...

DATC: 6.I.7. TEST CASE, ONLY ONE BUILD IN A HOME SUPPLY CENTER

But webdip doesn't show how it resovles this test: http://webdiplomacy.net/datc.php

By the rules of the board game, shouldn't both builds fail?

@yj, some interpretations would say the later order takes precedence, over-ruling the earlier one... it depends on who is running the game and whether they allow updates to orders after they have been entered.

But i can't remember what the rulebook says on the issue, and the DATC is the goto guide for automatic judges (computer adjudication, whatever you want to call it)

The boardgame rulebook (1999 edition) states:

"WRITING BUILDS AND DISBANDMENTS - Players write down which units they will disband (if any) and what type of unit will be built in a home supply center (if any). Any vague or invalid orders are ignored."

I would interpret the scenario of attempting to build two units in the same SC as a "vague or invalid" order, and therefore the order is ignored and no unit is built.

thats the passage I remember jamie, thanks.

Venergon, not true! Both Bulgaria and Spain have both north and south coasts. My admittedly facetious comment was meant to say that yes, you can build in Spain (north coast) and in Bulgaria (south coast), or vice-versa, meaning that you can technically "build a unit on the North Coast of a SC, while building a unit on the South Coast of a SC." :-)

You can't build in Spain or Bulgaria though.

Oh mujus, how very unhelpful you are...

But to the point, there is some question as to whether you should be able to order an Army built on the south coast of stp - i mean that doesn't make sense, and hence should be ignored by jamie's interpretation; alternatively, you could resolve any vagueness by taking the last or first set of orders as being valid (either assuming that the first valid order is correct, and thus followed, and only the second order is 'vague or invalid' - because if you ignored the first one, then the second one would make sense... OR as i previously suggested that the second order supersedes the first...)

Two perfectly logical, mutually exclusive interpretations of the rules (as written)