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Top 10 members by ℵᶜ ratings: Rank Member's name ℵᶜ ratings ℵᶜ rankings #1 @KudoShinichi04051983 834,94 12-kyu #2 @SuaNgonConBoCuoi 717,39 13-kyu #3 @doandinhlam22 700,00 13-kyu #4 @kiennguyen5114 600,00 14-kyu #5 @tuanfunboy 600,00 14-kyu #6 @acehoaquyen_2601 ⨂ 500,00 15-kyu #7 @NewGoodBee 500,00 15-kyu #8 @T0kito_Muichiro 500,00 15-kyu #9 @xXx_Arima_xXx ⊘ 500,00 15-kyu #10 ... ... ... Full leaderboard: https://docs.google.com/spreadsheets/d/1K4FtQ5CbXyBK5E3_hVBzk0Yxr8h1hYn_ciAO1UcLXp8/edit?usp=sharing Ask at the Q&A for more details. (Updated to Crazyhouse Tournament Pentad 1)

There are two types of ratings - rankings in the club: λ ratings - rankings, and; ℵ ratings - rankings. λ ratings - rankings λ ratings - rankings are calculated in all Blitz, Rapid, and Classical tournaments. 1. How to calculate λ ratings Suppose player A has a λ rating of λa, and player B has a λ rating of λb. The probability of A's winning is calculated by the formula: The K-factor of A is: The K-factor of B is: The new λ rating of A is: The new λ rating of B is: with Per(A), Per(B) is the number of points that A, B respectively achieved in a match. If A wins against B, then Per(A) = 1 If A loses to B, then Per(A) = 0 If A ties B, then Per(A) = 1/2 = 0,5 Note: Per(A) + Per(B) = 1 The λ ratings is always greater or equal than 1400 ( ≥ 1400 ), so the K-factor is always in the range [20;100] 2. List of ranks in λ rankings Rank's name Ratings range Category 5 1400,00 - 1519,99 Category 4 1520,00 - 1639,99 Category 3 1640,00 - 1759,99 Category 2 1760,00 - 1879,99 Category 1 1880,00 - 1999,99 Weak Advanced 2000,00 - 2099,99 Strong Advanced 2100,00 - 2199,99 Expert - Grade 1 2200,00 - 2299,99 Expert - Grade 2 2300,00 - 2399,99 Expert - Grade 3 2400,00 - 2499,99 Master - Level 1 2500,00 - 2599,99 Master - Level 2 2600,00 - 2699,99 Master - Level 3 2700,00 - 2799,99 Master - Level 4 2800,00 - 2899,99 Master - Level 5 2900,00+ ℵ ratings - rankings ℵ ratings - rankings are calculated in all Aleph Chess Tournaments, and all Arène Internationale d'Échecs. 1. How to calculate ℵ ratings Suppose player A has a ℵ rating of ℵa, and player B has a ℵ rating of ℵb. The β-factor of A is: The β-factor of B is: The probability of A's winning is calculated by the formula: The K-factor of A is: The K-factor of B is: The bonus point for A is: The bonus point for B is: The new ℵ rating of A is: The new ℵ rating of B is: with Per(A), Per(B) is the number of points that A, B respectively achieved in a match. If A wins against B, then Per(A) = 1 If A loses to B, then Per(A) = 0 If A ties B, then Per(A) = 1/2 = 0,5 Note: Per(A) + Per(B) = 1 The ℵ ratings is always greater or equal than 0 ( ≥ 0 ), so the K-factor is always in the range [17^1,6;7^1,6] 2. List of ranks in ℵ rankings Rank's name Ratings range Lowerbound (Lb(ℵ)) 20-kyu 0,00 - 99,99 0,00 19-kyu 100,00 - 199,99 100,00 18-kyu 200,00 - 299,99 200,00 17-kyu 300,00 - 399,99 300,00 16-kyu 400,00 - 499,99 400,00 15-kyu 500,00 - 599,99 500,00 14-kyu 600,00 - 699,99 600,00 13-kyu 700,00 - 799,99 700,00 12-kyu 800,00 - 899,99 800,00 11-kyu 900,00 - 999,99 900,00 10-kyu 1000,00 - 1099,99 1000,00 9-kyu 1100,00 - 1199,99 1100,00 8-kyu 1200,00 - 1299,99 1200,00 7-kyu 1300,00 - 1399,99 1300,00 6-kyu 1400,00 - 1499,99 1400,00 5-kyu 1500,00 - 1599,99 1500,00 4-kyu 1600,00 - 1699,99 1600,00 3-kyu 1700,00 - 1799,99 1700,00 2-kyu 1800,00 - 1899,99 1800,00 1-kyu 1900,00 - 1999,99 1900,00 1-dan 2000,00 - 2099,99 2000,00 2-dan 2100,00 - 2199,99 2100,00 3-dan 2200,00 - 2299,99 2200,00 4-dan 2300,00 - 2399,99 2300,00 5-dan 2400,00 - 2499,99 2400,00 6-dan 2500,00 - 2599,99 2500,00 7-dan 2600,00 - 2699,99 2600,00 8-dan 2700,00 - 2799,99 2700,00 9-dan 2800,00+ 2800,00 Club's "Titled" players When you become so good at chess (according to the club's ratings), you'll be awarded the club's "title". How to become a "titled" players Title λ ratings - rankings ℵ ratings - rankings [Club Expert] ≥ 2200(Expert - Grade 1 or highers) ≥ 2000(1-dan or highers) [Club Master] ≥ 2500(Master - Level 1 or highers) ≥ 2400(5-dan or highers) Ask at the Q&A for more details.

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UTC -06:00 (New York) UTC +00:00 (London) UTC +07:00 (Hanoi) Tournament's Name Category Rated? 07:30 13:30 20:30 Lambda Tournament Day DD 3-min Swiss λ rated 07:30, Saturday 13:30, Saturday 20:30, Saturday Aleph Chess Tournament Week WW 3-min Swiss λ rated ℵ rated 07:30, Jul 19th 13:30, Jul 19th 20:30, Jul 19th Arène Internationale d'Échecs Année YY 24-hour long,3-min Arena λ rated ℵ rated

As you know, there are two types of ratings - rankings in the club: λ ratings - rankings and ℵ ratings - rankings. Due to a number of reasons (mainly due to rating deflation and the Owner's desire to "follow the Trend"), the calculation of the above two types of ratings has changed significantly, leading to changes in the awarding of the Club's "Title", and major changes in the leaderboard display. This article will talk clearly about those changes. I. Changes in the calculation of λ ratings - rankings 1. Changes in the rating floor According to FIDE, from January 1, 2024, the rating floor was increased from 1000 to 1400 as a way to prevent rating deflation. As a type of rating inspired by FIDE's Elo ratings, the rating floor of λ ratings will also be increased from 1000 to 1400. 2. Changes in core computational elements Suppose player A has a λ rating of λa, and player B has a λ rating of λb. The formula for calculating A's probability of winning is changed from: to: The formula to calculating A's K-factor is changed from: to: 3. Changes in the λ rankings' list of rank Due to changes in the ranking calculation method, the ranks in λ rankings have also changed quite clearly. Categories are re-arranged according to the rating range of 120, Advanced rank is re-divided from 5 Grades (from Grade 1 to Grade 5) to 2 sub-ranks: Weak Advanced and Strong Advanced, Expert rank is re-divided into 3 Grades. Master rank - the newly added class - will also be divided into 5 Levels (from Level 1 to Level 5). II. The (almost) complete change of ℵ ratings - rankings Previously, ℵ ratings were a variant of λ ratings with a Progressive style like leveling up in a video game. However, after this change, ℵ ratings will become a variant of the European Go Federation (EGF) ratings. This change will change the calculation of many factors, but ℵ ratings will still keep the same Progressive style. The ℵ rankings' list of ranks has also been changed to suit the new calculation method. The lowest rank was moved from 15-kyu to 20-kyu, the highest rank was raised from 7-dan to 9-dan, and the rating range was kept fixed at 100. III. Changes in the awarding of the Club's "Title" Club's "Title" has also been changed to match the rankings of the two ratings. The [GMaster] title was officially removed, while the [Chess Expert] title was added as compensation for the removal. The title [Master] was renamed to [Chess Master], replacing the old title [GMaster]. The title [Chess Expert] is placed under the title [Chess Master], replacing the old title [Master]. IV. Major changes in the leaderboard display The full leaderboard will only show the participants' ratings, whether they are in the club or not, or whether they have been banned by Chess.com or not. Members who have not participated in tournaments in the club will be considered [Unrated], with a λ rating of 1400 and a ℵ rating of 0. Compare the leaderboards according to the new and old calculations (as of Week 8): Rank Username (new λ ratings) Username (old λ ratings) #1 @Higanbana-Onmyoji (1830,06) @Higanbana-Onmyoji (1646,55) #2 @xXx_Arima_xXx (1737,51) @xXx_Arima_xXx (1488,02) #3 @thuytran2022 ⊘ (1708,02) @thuytran2022 ⊘ (1473,51) #4 @tuanfunboy (1695,43) @PLGodFlo (1411,87) #5 @PLGodFlo (1673,80) @tuanfunboy (1389,91) #6 @thenomalnoob (1624,82) @tuanfunbo (1371,28) #7 @kusmahesh (1615,44) @LeTuaanAnhh (1342,83) #8 @Dikirotaro ⨂ (1611,90) @kiennguyen5114 (1303,38) #9 @tuanfunbo (1592,94) @HoangTiennb (1298,11) #10 @Sjakkongen09 ⊘ (1588,88) @VAnh122 ⨂ (1281,67) Rank Username (new ℵ ratings) Username (old ℵ ratings) #1 @Higanbana-Onmyoji (1014,97) @Higanbana-Onmyoji (589,22) #2 @NobuKenko (900,00) @thenomalnoob (450,00) #3 @thenomalnoob (700,00) @NobuKenko (450,00) #4 @xXx_Arima_xXx (563,22) @doandinhlam22 (434,25) #5 @tuanfunboy (478,43) @tuanfunboy (383,58) #6 @PLGodFlo (449,67) @xXx_Arima_xXx (344,31) #7 @doandinhlam22 (424,76) @PLGodFlo (340,00) #8 @kiennguyen5114 (407,27) @phamleducviet123 (340,00) #9 @Dikirotaro ⨂ (400,00) @kiennguyen5114 (296,33) #10 @HaoTranQuang (400,00) @baotri6plus (265,62) Last note: The above changes will be put into effect after I finish calculating participants' ratings (about 2 more days). Hope you will feel better with the above changes. Thanks for reading.

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Ratings: 1100 – 1400

How many brilliant move do you have? Me is 2, I was very surprised when I had my first brilliant move and I thought it was impossible. The second one is the one I had played with my boyfriend ))) 🥰🥰🥰

Rating: 1100 – 1400

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As you all know, the International Chess Day / World Chess Day is celebrated on July 20th (every year). It celebrates the long history of chess, recognizes the role chess plays in connecting people across societies, recognize the important role of the FIDE in supporting international cooperation for chess activity and aiming to improve friendly harmony among all peoples of the world, and to provide an important platform to foster, dialogue, solidarity and culture of peace. So, what will we do in the July 20th to celebrate the International Chess Day? It's only 11 days left!

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