2015 UK Riichi Mahjong Open Results (Day 2 Final Results)

Edit 18/08: UKMA have uploaded the rankings to their website (http://www.ukmahjong.co.uk/results.html), however there seems to be a few errors in their table. Differences from the table below and the ‘official’ table:
Paola Bungaro: 109900 -> 110600
Nick Dyer: 89800 -> 57900
Junichi Tanaka: 37500 -> 30500
Takao Sasaki: 34500 -> 30500
fixed

2015 UK Riichi Mahjong Open
Rank Name Day 1 Day 2 Total
1 Peter Langford 166900 95800 262700
2 Yihe Lu 74600 152900 227500
3 Jasper Germeys 135300 79900 215200
4 Philip Bielby 234600 -33100 201500
5 Gemma Sakamoto 45000 97100 142100
6 Martin Lester 145800 -29100 116700
7 Paola Bungaro 49600 60300 109900
8 Katie Lau 54900 35300 90200
9 Nick Dyer 1000 88800 89800
10 Timur Hahn 13200 74200 87400
11 Daina Chiba 19300 49100 68400
12 Philipp Martin -12300 68200 55900
13 Andy Mathew 39500 14000 53500
14 Junichi Tanaka 115000 -77500 37500
15 Takao Sasaki -39100 73600 34500
16 Tim & John (sub) 48000 -18600 29400
17 Dominic Saxton -36700 56700 20000
18 Tom Wood 30700 -10800 19900
19 Kimihito Tanaka -14200 32200 18000
20 David Bresnick 13800 -5300 8500
21 Aidan Robison -31600 35200 3600
22 Max Bowsher 35100 -48100 -13000
23 Radka Pernicova 74100 -95200 -21100
24 Filip Navratil -71300 44000 -27300
25 Katharina Schatz -111700 79300 -32400
26 Sonia Yagi -27000 -15700 -42700
27 Michael Donaghy -22700 -26000 -48700
28 Martijn Gulmans 39800 -93400 -53600
29 Mark Haines -87100 22600 -64500
30 Shaun Drury -52100 -36700 -88800
31 Ian Fraser -84900 -18900 -103800
32 Jem Short -97600 -8100 -105700
33 Alex Leet -99000 -11300 -110300
34 Richard Langtry 22700 -155800 -133100
35 Hanqian Ren -53000 -83100 -136100
36 Mike Short -94900 -41600 -136500
37 David Stallan -40800 -100700 -141500
38 Susan Cumming -100800 -46100 -146900
39 Peter Muriel -139000 -81500 -220500
40 Andrew Smith -143100 -122600 -265700

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Bots on Tenhou? More likely than you think!

Inspired by Shogi’s ‘Denousen’, a niconico sponsored AI vs professional tournament, Tsunoda has posted on Tenhou’s blog a few months ago that he wanted to hold similar tournaments.

While bots were previously banned from Tenhou, with permission from Tsunoda, programmers may now allow their bots to play in joukyuu, and must also wait for Tsunoda’s permission before letting it run loose in tokujou if it reaches that level.

Bots have a special prefix “ⓝ”, which stands for Nonplayer, to distinguish them from players. There’s currently one bot that I know of, ⓝ爆打. It peaked at around 5D R1850~ but has recently fell to 4D R1780~ and Tsunoda is still unsure if he should allow it to enter tokujou. Naoki Mizukami, The author of 爆打, has wrote a few papers (in Japanese) about Mahjong AI, these can be read on his site. All of the bots games can be viewed at https://twitter.com/ai_mahjong

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Tohai S1 is completely subbed!

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Tohai Season 1

xkime previously subbed episode 1 of the live action adaptation of Shinasaka’s Tohai manga, since then he has moved on to subbing it on Rakuten’s (free) streaming service viki and has just finished subbing the final episode of season 1.

Season 2 is also available here some of the episodes have been subbed by someone else, but I think the subtitles need a bit of editing before they become watchable.

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Identifying Dangerous Suji

Suji are a popular defense strategy; so popular, in fact, that suji traps are an effective anti-defense. We would like to increase the yomi level and create an anti-anti-defense by identifying when suji traps are likely. Are there situations in which suji are more dangerous? Are they really traps, or are they just incidental discards?

Prominent authors actually disagree on this. Some claim that suji discarded after riichi are more dangerous, while others claim that suji discarded before riichi are more dangerous. The general agreement is that the tile discarded immediately upon declaring riichi is dangerous.

Who’s right? Do you think there’s a difference? Using the Tenhou game logs database, we can examine riichi hands and their discards to finally answer this question.

(more…)

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