public void DeclareWinner(Guid roundId, Guid playerId)
{
var entities = ValidateIds(roundId, playerId);
_ledgerService.AwardWinnings(playerId, entities.Item1.EntrantPlayerIds.Count);
entities.Item1.WinningPlayerId = playerId;
entities.Item1.IsOpen = false;
UpdateEntity(entities.Item1, a => a.Id == roundId);
}