Peer-to-peer pick generation and placement

A computer-implemented method comprising:

• as implemented by one or more computing devices configured with specific computer-executable instructions,
• requesting, via a first user device, a first user to select an event pick market and to select event pick terms for the event pick market to create a challenge event pick;
• in response to selection of the event pick market and the event pick terms, generating user interface data that, when rendered by a second user device, causes the second user device to display a user interface depicting an invitation for a second user to accept the challenge event pick;
• in response to an acceptance by the second user of the challenge event pick, determining, via a concurrency resolution system, that a placed pick data store does not comprise acceptance flag data in association with the challenge event pick;
• in response to the determination that the placed pick data store does not comprise the acceptance flag data in association with the challenge event pick, updating the placed pick data store to include the acceptance flag data in association with the challenge event pick;
• and
• adjusting entries data of the first user and of the second user based on the event pick terms of the challenge event pick.

Non-transitory, computer-readable storage media comprising computer-executable instructions, wherein the computer-executable instructions, when executed by a computer system, cause the computer system to:

• request, via a first user device, a first user to select an event pick market and to select event pick terms for the event pick market to create a challenge event pick;
• in response to selection of the event pick market and the event pick terms, generate user interface data that, when rendered by a second user device, causes the second user device to display a user interface depicting an invitation for a second user to accept the challenge event pick;
• in response to an acceptance by the second user of the challenge event pick, determine, via a concurrency resolution system, that a placed pick data store does not comprise acceptance flag data in association with the challenge event pick;
• in response to the determination that the placed pick data store does not comprise the acceptance flag data in association with the challenge event pick, update the placed pick data store to include the acceptance flag data in association with the challenge event pick;
• and
• adjust entries data of the first user and of the second user based on the event pick terms of the challenge event pick.