Escrow terms:
Both users need to sign a message with the address holding the funds.
No signed message = no deal.
Uh, an escrow here would mean, both of you send 10 BTC each to the escrow, then when one of you wins the escrow sends the prize. I for one don't believe any of you have built up enough reputation not to scam 10 BTC when the time comes
Please don't kill the good samaritan.