I added my ranking of all played challenge matches to my beempy site: https://beempy.com/static/sm_ranking.html.
How does it work?
I continuously storing all custom_json operation containing a sm_submit_team id in my database. Then, I checked the steemmonsters API: https://steemmonsters.com/battle/result?id=trx_id by entering the transaction id. When the match_type is equal to Challenge, I store the battle results. Declined matches are skipped.
ELO ranking
Every hour, I will update the ranking on the beempy site.
The player expected score depends on the rating difference between player A and B.
R_A is the rating of player A and R_B is the rating of player B.
When R_A is 200 and R_B is 0, the expected score for player A is
1/(1+10**(-200/400)) = 0.7597
which means that player A has a probability of 76% to win and 24% to lose the match.
When the match result is known, the ranking of both player can be updated by:
where R_A is the old ranking, K is the predefined K-factor, E_A is the expected score of player A and S_A is the match result for player A (1 -> A won, 0.5 -> draw and 0 -> A lost). The equation is similar for player B.
The K-factor is 40 for players which have played less than 30 games. It is set to 20 for players with a rating below 2400 and is set to 10 for players with a rating above 2400.
Some numbers
10572 challenges were played from 737 different players.
@toocurious is currently #1 with a ELO rating of 357.43 (141 wins and 202 played games). Congratulations, good work!
Why has the graph for total number of SteemMonsters players changed and number dropped so much?
Posted using Partiko iOS
Very cool! I've never played SteemMonsters myself (or any card game for that matter), but I'm always interested in competitive games - especially when they use an Elo rating system (btw it is named after its creator Arpad Elo, it's not an abbreviation). Do you play it yourself, or are you just creating useful tools for it?
Both, I like to play it and like to develop useful tools for it :).
Great work! The blockchain has some great features given its transparency and the ability to use its data for reporting like this. Amazing how quickly this continues to evolve! Thanks!
Posted using Partiko iOS
Latest update is almost two months past?
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