{"id":1059,"date":"2026-06-04T15:45:53","date_gmt":"2026-06-04T15:45:53","guid":{"rendered":"https:\/\/ukmahjong.co.uk\/?page_id=1059"},"modified":"2026-06-09T18:12:10","modified_gmt":"2026-06-09T18:12:10","slug":"the-mahjong-uk-ranking-system-mukrs","status":"publish","type":"page","link":"https:\/\/ukmahjong.co.uk\/index.php\/the-mahjong-uk-ranking-system-mukrs\/","title":{"rendered":"The Mahjong UK Ranking System (MUKRS)"},"content":{"rendered":"\n

Invitations to play in International events are allocated to the UKMA by their governing bodies and are limited by country. To aid in the selection of participants in these events, the UKMA has introduced its own ranking system, the Mahjong UK Ranking System (MUKRS)<\/strong>. This is an evolution of the Mahjong European Ranking System (MERS) used by the European Mahjong Association (EMA).<\/p>\n\n\n\n

It uses the same tournament result data as MERS, pulling this data from the EMA website. This means UK players need an EMA ID and to compete in a registered EMA tournament before they will appear in MUKRS.<\/p>\n\n\n\n

Note, in addition to MUKRS, to be eligible for selection players must have participated, as a UK representative, in a minimum of sixteen days of MERS tournament play in the three years preceding the Selection Date. A minimum of four such MERS tournament days must have been outside the UK and a minimum of four days within the UK.<\/p>\n\n\n\n

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For more details on the background to MUKRS, see the “Selection of UK Participants for Limited Access Tournaments<\/a>” post dated June 2026. <\/p>\n<\/blockquote>\n\n\n\n

Since MUKRS is an evolution of MERS, let’s start by recapping how MERS works:<\/p>\n\n\n\n

MERS (Mahjong European Ranking System)<\/h1>\n\n\n\n

In MERS, your performance at each tournament is recorded as a value between 0 and 1000. The winner of the tournament gets 1000, last place gets 0, and every other position is evenly spaced.<\/p>\n\n\n\n

For example: if you finish 32nd out of 60, then you beat 28 out of your 59 opponents. 28 divided by 59 is 0.475, so your MERS result would be 475.<\/p>\n\n\n\n

<\/a>Weights<\/h3>\n\n\n\n

Every tournament has a weight, which is applied to the results. This is typically between 1 and 6.<\/p>\n\n\n\n

<\/a>Result decay<\/h3>\n\n\n\n

Results older than a year have their weight halved. Results older than two years no longer count.<\/p>\n\n\n\n

<\/a>Minimum participation<\/h3>\n\n\n\n

To give a representative ranking, MERS has a minimum participation of 5 tournaments. Players with fewer than 5 results are given placeholder results until they have 5 results. Each of these placeholder results is a 0 (corresponding to last place) with weight 1.<\/p>\n\n\n\n

<\/a>The two parts of the MERS ranking<\/h3>\n\n\n\n

A player’s MERS ranking is calculated in two parts. These parts are both weighted averages of certain sub-selections of your results.<\/p>\n\n\n\n

‘Weighted average’ means multiplying each result by its weight and summing the results, before finally dividing by the sum of the weights. Thus, results with a higher weight count more.<\/p>\n\n\n\n

\n
\n

<\/a>Part A – Your consistency<\/h4>\n\n\n\n

Part A is the weighted average of all of your results.<\/p>\n\n\n\n

However, a player with at least 10, 15, 20… results can leave their worst 1, 2, 3… results out of this calculation.<\/p>\n\n\n\n

<\/a>Part B – Your achievements<\/h4>\n\n\n\n

Part B is the weighted average of your four best results.<\/p>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n

<\/a><\/p>\n\n\n\n

The MERS ranking<\/h3>\n\n\n\n

A player’s final MERS ranking is the average of their Part A and Part B.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

<\/p>\n\n\n\n

\n\n\n\n

<\/a>An explanation of MUKRS<\/h1>\n\n\n\n

MUKRS aims to resemble and iterate on MERS.<\/p>\n\n\n\n

<\/a>MUKRS results<\/h3>\n\n\n\n

Upon completing a tournament, your performance is recorded as a set of results that contribute to your MUKRS ranking. The results have a value equal to the player’s base rank (0 to 1000) at the tournament, as defined by MERS.<\/p>\n\n\n\n

The key difference from MERS is that the results are unweighted.<\/p>\n\n\n\n

Instead, the result is duplicated<\/strong> until there are as many results as there are days in the tournament<\/strong>.<\/p>\n\n\n\n

<\/a>Open events only<\/h3>\n\n\n\n

Only open events count toward MUKRS. Invitational events do not count.<\/p>\n\n\n\n

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Important<\/strong><\/p>\n\n\n\n

To ensure that excellent performances at European championships are rewarded, a UK player finishing in the top 3% at an OEMC or ERMC, not receiving a seat directly from EMA for the following World Mahjong Championship (WMC) or World Riichi Championship (WRC), is guaranteed selection by UKMA for that WMC or WRC (provided that they are not beaten at that OEMC\/ERMC by another UK player in this category).<\/p>\n\n\n\n

For example, under this system, if the top UK player at ERMC 2024 (which had 172 players) finished 5th, they would have secured selection for WRC 2025.<\/p>\n<\/blockquote>\n\n\n\n

<\/a>Result decay<\/h3>\n\n\n\n

Results older than the date when selections were made for the previous tournament of the type being selected for, no longer count.<\/p>\n\n\n\n

For example, selections for ERMC 2030 will not consider results achieved before the selections were made for ERMC 2027.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

<\/p>\n\n\n\n

<\/a>Minimum participation<\/h3>\n\n\n\n

To give a representative ranking, MUKRS has a minimum participation of 16 days of tournament play. Players with fewer than 16 days (and thus, 16 results) are given placeholder results until they have 16 results. Each of these placeholder results has value 0 (corresponding to last place).<\/p>\n\n\n\n

<\/a>The two parts of the MUKRS ranking<\/h3>\n\n\n\n

A player’s MUKRS ranking is calculated in two parts.<\/p>\n\n\n\n

\n

<\/a>Part A – Your consistency<\/h4>\n\n\n\n

Part A is the average of the top 80% of your results, rounded up.<\/p>\n\n\n\n

For example, a player with between 20 and 24 results may ignore their lowest 4 results.<\/p>\n\n\n\n

<\/a>Part B – Your achievements<\/h4>\n\n\n\n

Part B is the average of your 8 best results.<\/p>\n<\/div><\/div>\n\n\n\n

<\/a><\/p>\n\n\n\n

The MUKRS ranking<\/h3>\n\n\n\n

A player’s final MUKRS ranking is the average of their Part A and Part B.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

<\/p>\n\n\n\n

\n\n\n\n

<\/a>A Worked Example<\/h2>\n\n\n\n

Consider a player with the following results:<\/p>\n\n\n\n

Tournament length in days<\/strong><\/th>MERS base rank<\/strong><\/th><\/tr><\/thead>
3<\/td>550<\/td><\/tr>
2<\/td>850<\/td><\/tr>
2<\/td>300<\/td><\/tr>
3<\/td>900<\/td><\/tr>
2<\/td>400<\/td><\/tr>
1<\/td>600<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Recall that each result is repeated the same number of times as there are days in the tournament.<\/p>\n\n\n\n

Thus, the player’s list of MUKRS results looks like this:<\/p>\n\n\n\n

Result<\/th>Counts for Part A<\/th>Counts for Part B<\/th><\/tr><\/thead>
900<\/td>Yes<\/td>Yes<\/td><\/tr>
900<\/td>Yes<\/td>Yes<\/td><\/tr>
900<\/td>Yes<\/td>Yes<\/td><\/tr>
850<\/td>Yes<\/td>Yes<\/td><\/tr>
850<\/td>Yes<\/td>Yes<\/td><\/tr>
600<\/td>Yes<\/td>Yes<\/td><\/tr>
550<\/td>Yes<\/td>Yes<\/td><\/tr>
550<\/td>Yes<\/td>Yes<\/td><\/tr>
550<\/td>Yes<\/td>No<\/td><\/tr>
400<\/td>Yes<\/td>No<\/td><\/tr>
400<\/td>Yes<\/td>No<\/td><\/tr>
300<\/td>No<\/td>No<\/td><\/tr>
300<\/td>No<\/td>No<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The top 8 results count for part B.<\/p>\n\n\n\n

The top 80% of results (rounded up) count for part A, that is, the bottom 20% (rounded down) don’t count. This player has 13 results, so the two worst results don’t count.<\/p>\n\n\n\n

The calculations have the following results:<\/p>\n\n\n\n

Part A<\/th>Part B<\/th>MUKRS ranking<\/th><\/tr><\/thead>
645.83<\/td>762.5<\/td>704.17<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Invitations to play in International events are allocated to the UKMA by their governing bodies and are limited by country. To aid in the selection of participants in these events, the UKMA has introduced its own ranking system, the Mahjong UK Ranking System (MUKRS). This is an evolution of the Mahjong European Ranking System (MERS)… Read More »The Mahjong UK Ranking System (MUKRS)<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":1065,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"class_list":["post-1059","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/ukmahjong.co.uk\/index.php\/wp-json\/wp\/v2\/pages\/1059","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ukmahjong.co.uk\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ukmahjong.co.uk\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ukmahjong.co.uk\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ukmahjong.co.uk\/index.php\/wp-json\/wp\/v2\/comments?post=1059"}],"version-history":[{"count":21,"href":"https:\/\/ukmahjong.co.uk\/index.php\/wp-json\/wp\/v2\/pages\/1059\/revisions"}],"predecessor-version":[{"id":1138,"href":"https:\/\/ukmahjong.co.uk\/index.php\/wp-json\/wp\/v2\/pages\/1059\/revisions\/1138"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ukmahjong.co.uk\/index.php\/wp-json\/wp\/v2\/media\/1065"}],"wp:attachment":[{"href":"https:\/\/ukmahjong.co.uk\/index.php\/wp-json\/wp\/v2\/media?parent=1059"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}