GCOM Logo by Kristen Meyer
April 26th - 29th, 2018
Tall Cedars of Lebanon
2501 Putty Hill Ave
Parkville MD 21234

An Open Gaming Event
Have Fun, Learn, Share, Grow, Play

GCOM Logo by Kristen Meyer

Discussion list and rules
Trade list (post games here)
Deadline for posting games: Tuesday, April 17 2018, 10:00 pm Eastern
Deadline for want list submissions: Tuesday, April 24 2018, 10:00 pm Eastern

Math trades are a great way to swap games with other people. GCOM will be having a math trade at Games Day 2018. The advantage of this math trade is there will be no need to ship any games saving time and a lot of money. However, you must attend Game Days or give you games to someone that will be attending. I suspect that for many people this will their first math trade, so I'll try and explain the process.

What is a math trade?

This is a trade between a whole bunch of people at once, using a computer program to decide who should send their game to whom. Each participant lists what items they want in exchange for their game, this way you can never get something you don't want. Sometimes this kind of trade is called a "mathematical no-risk trade list." This is just a longer name for the same thing.

Why is a math trade worthwhile?

By matching together the likes and dislikes of a lot of people at the same time, many more trades become possible. Say person A wants the game Queen's Necklace, and person B has a copy of it which they don't especially want to keep. B doesn't want any of A's games, but would like a copy of Jambo. Person C has Jambo for trade, but doesn't want any of B's games. But C would like Razzia, which person A is interested in trading. So although there's no good trade between two of A, B, and C, the three together can each trade a game away to get a game they really want. The software figures out these fortunate coincidences, and assigns trades so that everyone gets games they want in return for trading away games they don't. In the above example you would have these trades: A sends Razzia to C, and gets Queen's Necklace from B B sends Queen's Necklace to A, and gets Jambo from C C sends Jambo to B, and gets Razzia from A So you get a circle of trades among the participants and each trader gets a game they asked for.

How will this work?

The trade will take place through www.boardgamegeek.com. There are two lists on boardgamegeek for the trade. The first list is the discussion thread. You should read all of the rules in this thread and subscribe to the thread so you can be informed about any changes that may occur. You may also ask any questions about the trade here. The second list is the actual trade list. You will add a new item for each game you want to trade. You may list more than one game in the same geeklist item if you want to trade more than one game as a bundle (such as a game and its expansion).

Game submissions will be accepted until the submission deadline. See the trade list on boardgamegeek for the exact time. After this you will have one week to submit the list of games you want (your want lists). We will be using the On Line Want List Generator (OLWLG) to submit want lists. Please see the discussion thread for help and more information, including deadlines.

The trade will probably take place on Saturday at 2:00 pm.

Tips for new traders

  • Follow the usual guidelines for trades and sales. Describe your game clearly. In particular, mention the condition of the game, if it is in a language other than English, and the edition (if you know). When sending the game, package it carefully.
  • It can pay to check other traders' want lists. By offering a game lots of other people want, you greatly increase the chance you'll get something you want, too.
  • If you're really hoping to get a particular game or games, try to offer a game of roughly the same or higher trade value.
  • When offering multiple items together, try to group games that are related somehow. That way, you're more likely to find someone interested in the whole lot.