Rules of the 4th Lichess Bots Championship

Rules of the 4th Lichess Bots Championship:

You have to be a lichess BOT and post at https://lichess.org/forum/team-lichess-bots-championship/participants-of-the-4th-lichess-bots-championship before the 1st of December 2019 UTC to participate. Please read the rules carefully and only join the tournament if you're going to complete it.

The 4th Lichess Bots Championship will start on the 1st of December 2019 UTC and doesn't have the same rules as the previous Lichess Bots Championships. For games to count they all have to be standard 15+20 rated games. You don't have to post the results, arbiter @Ajile will simply search for all of the standard 15+20 rated games that are played between participants during the tournament. Matches are won at the first time when one participant gets a 4 point advantage over another (for example 7 won games, many drawn games and 3 lost games against an opponent during the tournament). During the entire tournament only your first match against an opponent will count.

From the 1st of December to the 6th of December 2019 UTC, all participants can challenge each other to matches (at any time), so you can play as many games on a day as you want and all results that are according to the rules automatically count. Each participant can contact its opponent to agree on a time and date (and other agreements that are allowed within the rules), but unlike previous Lichess Bots Championships, you don't have to agree on a time to play and the owner of the bot doesn't have to be present, you can just challenge an opponent whenever it's convenient for you.

On the 7th of December 2019 UTC, Ajile will create four groups (group A is the highest group, group D is the lowest group), based on how many participants each bot has defeated. This is regardless of the amount of losses, so it doesn't hurt to lose against bots that end up in different groups. The results against bots that do end up in your group, will carry over into that group. The best way to get many points is to play many matches (but only one against each bot). Participants that played less than 4 tournament games, are removed from the tournament. If bots have defeated the same amount of participants, the bot with the higher 'proficiency score' has a higher ranking. The 'proficiency score' is used throughout the tournament, but it isn't very important and it probably won't play a role in determining the winner of the tournament, it's mostly a practical tool to help determine the groups when there are ties. The 'proficiency score' of a bot is calculated with: rated wins / rated losses * (rated wins + rated draws) / rated losses. It is used to make sure there aren't any ties, because no bots have played (and won) the exact same amount of games on Lichess (not only the games of this tournament count for the 'proficiency score', but all rated games a bot has played on Lichess). The tournament is split into groups to limit how many opponents you have to play against and to make sure you have to win against other bots that are approximately your strength if you want to win your group.

From the 8th of December to the 13th of December 2019 UTC, all remaining participants can challenge each other, but only the results against participants from their own group count (including the tournament results they achieved against participants from their group during the previous week, they 'cannot' play more matches against them in the tournament). On the 14th of December 2019 UTC, Ajile will split all groups in two based on how many participants from their own group each bot has defeated. If bots have defeated the same amount of participants, the bot with the higher 'proficiency score' has a higher ranking. Group A1 is the highest group, group D2 is the lowest group. Participants that played less than 16 tournament games so far, are removed from the tournament.

From the 15th of December to the 20th of December 2019 UTC, all remaining participants can challenge each other, but only the results against participants from their own group count (including the tournament results they achieved against participants from their group during the previous two weeks, they 'cannot' play more matches against them in the tournament). Some participants will already have played against all participants from their group before the end of the week. On the 21st of December 2019 UTC, Ajile decides the ranking in the same way as in week 1 and 2, but the final ranking has to have a clear winner (especially in group A1, which decides the winner of the tournament), so if during week 3 it seems like two participants will end up with the same amount of participants from their own group they have defeated, they can play an additional match against each other to determine who of them gets a better final ranking. The winner of group A1 is the winner of the 4th Lichess Bots Championship. In general, all bots play all three weeks, bots don't get eliminated (Ajile just splits the tournament into more groups so bots play against their own strength more often). The exception is when bots don't play enough games (so only participants who actually want to play get challenged to matches). Group A is higher than group D, but that doesn't mean that bots in group A will play more matches. So it's different from the 3rd Lichess Bots Championship, where stronger bots played more matches.

Rules of the 4th Lichess Bots Championship: You have to be a lichess BOT and post at https://lichess.org/forum/team-lichess-bots-championship/participants-of-the-4th-lichess-bots-championship before the 1st of December 2019 UTC to participate. Please read the rules carefully and only join the tournament if you're going to complete it. The 4th Lichess Bots Championship will start on the 1st of December 2019 UTC and doesn't have the same rules as the previous Lichess Bots Championships. For games to count they all have to be standard 15+20 rated games. You don't have to post the results, arbiter @Ajile will simply search for all of the standard 15+20 rated games that are played between participants during the tournament. Matches are won at the first time when one participant gets a 4 point advantage over another (for example 7 won games, many drawn games and 3 lost games against an opponent during the tournament). During the entire tournament only your first match against an opponent will count. From the 1st of December to the 6th of December 2019 UTC, all participants can challenge each other to matches (at any time), so you can play as many games on a day as you want and all results that are according to the rules automatically count. Each participant can contact its opponent to agree on a time and date (and other agreements that are allowed within the rules), but unlike previous Lichess Bots Championships, you don't have to agree on a time to play and the owner of the bot doesn't have to be present, you can just challenge an opponent whenever it's convenient for you. On the 7th of December 2019 UTC, Ajile will create four groups (group A is the highest group, group D is the lowest group), based on how many participants each bot has defeated. This is regardless of the amount of losses, so it doesn't hurt to lose against bots that end up in different groups. The results against bots that do end up in your group, will carry over into that group. The best way to get many points is to play many matches (but only one against each bot). Participants that played less than 4 tournament games, are removed from the tournament. If bots have defeated the same amount of participants, the bot with the higher 'proficiency score' has a higher ranking. The 'proficiency score' is used throughout the tournament, but it isn't very important and it probably won't play a role in determining the winner of the tournament, it's mostly a practical tool to help determine the groups when there are ties. The 'proficiency score' of a bot is calculated with: rated wins / rated losses * (rated wins + rated draws) / rated losses. It is used to make sure there aren't any ties, because no bots have played (and won) the exact same amount of games on Lichess (not only the games of this tournament count for the 'proficiency score', but all rated games a bot has played on Lichess). The tournament is split into groups to limit how many opponents you have to play against and to make sure you have to win against other bots that are approximately your strength if you want to win your group. From the 8th of December to the 13th of December 2019 UTC, all remaining participants can challenge each other, but only the results against participants from their own group count (including the tournament results they achieved against participants from their group during the previous week, they 'cannot' play more matches against them in the tournament). On the 14th of December 2019 UTC, Ajile will split all groups in two based on how many participants from their own group each bot has defeated. If bots have defeated the same amount of participants, the bot with the higher 'proficiency score' has a higher ranking. Group A1 is the highest group, group D2 is the lowest group. Participants that played less than 16 tournament games so far, are removed from the tournament. From the 15th of December to the 20th of December 2019 UTC, all remaining participants can challenge each other, but only the results against participants from their own group count (including the tournament results they achieved against participants from their group during the previous two weeks, they 'cannot' play more matches against them in the tournament). Some participants will already have played against all participants from their group before the end of the week. On the 21st of December 2019 UTC, Ajile decides the ranking in the same way as in week 1 and 2, but the final ranking has to have a clear winner (especially in group A1, which decides the winner of the tournament), so if during week 3 it seems like two participants will end up with the same amount of participants from their own group they have defeated, they can play an additional match against each other to determine who of them gets a better final ranking. The winner of group A1 is the winner of the 4th Lichess Bots Championship. In general, all bots play all three weeks, bots don't get eliminated (Ajile just splits the tournament into more groups so bots play against their own strength more often). The exception is when bots don't play enough games (so only participants who actually want to play get challenged to matches). Group A is higher than group D, but that doesn't mean that bots in group A will play more matches. So it's different from the 3rd Lichess Bots Championship, where stronger bots played more matches.

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