non-blocking-ok.py

import asyncio
import aioredis


async def add_new_win(pool, winner):
    # Creating tasks doesn't schedule them
    # so you can create multiple and then 
    # schedule them all in one go using `gather`
    task1 = pool.zincrby('wins_counter', 1, winner)
    task2 = pool.incr('total_games_played')
    await asyncio.gather(task1, task2)
    
async def main():
    # Connect to Redis
    pool = await aioredis.create_redis_pool('redis://localhost', encoding='utf8')
    # Tail the event stream
    last_id = '$'
    while True:
        events = await pool.xread(['wins_stream'], latest_ids=[last_id], timeout=0, count=10)
        tasks = []
        for _, e_id, e in events:
            winner = e['winner']
            # Again we don't actually schedule any task,
            # and instead just prepare them
            tasks.append(add_new_win(pool, winner))
            last_id = e_id
        # Notice the spread operator (`*tasks`), it
        # allows using a single list as multiple arguments
        # to a function call.
        await asyncio.gather(*tasks)

if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())

Hi Leonh, thank you for the correction, I've updated the code.
The problem with binary strings is solved by adding encoding=utf8 to the client connection constructor, while the second problem was definitely a mixup on my part when bouncing between aio-redis and redis-py.

Thanks again for the correction!