Life In 19x19http://lifein19x19.com/ Handicap & Komi for 9×9 and 13×13 Boardshttp://lifein19x19.com/viewtopic.php?f=10&t=16737 Page 1 of 1

 Author: Bonobo [ Wed Jul 03, 2019 6:40 am ] Post subject: Handicap & Komi for 9×9 and 13×13 Boards What do our experts think of this Handicap & Komi table for 9×9 & 13×13 boards?I collated H&K suggestions from two different PDFs posted in the German DGoB forum into this table and would like to know what people experienced with small-board tournaments may have to add, comment, or improve.Thanks in advance.Attachment: Handicap & Komi for 9x9 & 13x13 sm.jpeg [ 134.07 KiB | Viewed 798 times ]

 Author: HermanHiddema [ Wed Jul 03, 2019 7:33 am ] Post subject: Re: Handicap & Komi for 9×9 and 13×13 Boards Those tables are severely broken.On 9x9, after +0,5 the next value should be -0,5, then -1,5 all the way to -5,5 or -6,5 before you give 2 handicap.Similarly, on 13x13 there should be -3,5 and perhaps -6,5 before giving handicap.

 Author: HermanHiddema [ Wed Jul 03, 2019 7:53 am ] Post subject: Re: Handicap & Komi for 9×9 and 13×13 Boards To make such tables, we need three values:A. The point value of a stone in the opening (2x komi)B. The point value of sente in the opening (komi)C. The point value of 1 rank difference on that board size (on 19x19 this equal to the point value of 1 stone)Then black should get C points per rank compensation.Suppose we take the value of a handicap stone on 9x9 as 14. and the value of one rank as 2 points, then black should get one stone every 7 ranks. And additionally the komi should be adjusted by 2 points every rank. Your table does have 1 extra stone per 7 ranks, but only 1 point per rank. A correct table would be:0 => even + 6,51 => even + 4,52 => even + 2,53 => even + 0,54 => even - 1,55 => even - 3,56 => even - 5,57 => 2 stones + 6,58 => 2 stones + 4,59 => 2 stones + 2,510 => 2 stones + 0,511 => 2 stones - 1,512 => 2 stones - 3,513 => 2 stones - 5,514 => 3 stones + 6,515 => 3 stones + 4,516 => 3 stones + 2,517 => 3 stones + 0,518 => 3 stones - 1,519 => 3 stones - 3,520 => 3 stones - 5,521 => 4 stones + 6,5etcIn the table you have, there's a huge jump between 6 ranks (very unfair to black) and 7 ranks (perfectly reasonable).

 Author: Uberdude [ Wed Jul 03, 2019 8:10 am ] Post subject: Re: Handicap & Komi for 9×9 and 13×13 Boards See https://senseis.xmp.net/?HandicapForSmallerBoardSizes, which links to https://web.archive.org/web/20080112004 ... handicaps/ with handicaps for 13x13 as used at the British small board championship and more generous to black (or should that be less generous to white as white tended to win too much) from the Cambridge club's Sonoyama 13x13 tournament (which is 10 min SD, should generally help white compared to slower time limits).

Author:  gennan [ Wed Jul 03, 2019 12:29 pm ]
Post subject:  Re: Handicap & Komi for 9×9 and 13×13 Boards

Uberdude wrote:
See https://senseis.xmp.net/?HandicapForSmallerBoardSizes, which links to https://web.archive.org/web/20080112004 ... handicaps/ with handicaps for 13x13 as used at the British small board championship and more generous to black (or should that be less generous to white as white tended to win too much) from the Cambridge club's Sonoyama 13x13 tournament (which is 10 min SD, should generally help white compared to slower time limits).

So for 9x9, the Cambridge handicap is 1 stone per 5 ranks and Bonobo's handicap is 1 stone per 7 ranks.
In my kids club I started with 1 stone per 6 ranks and I think it's holding up well over the years.
It means I give 8 stones to a novice (42k) and 4 stones to an 18k.

And for 13x13, the 'BGA' handicap is 1 stone per 3 ranks, while the Cambridge/Sonoyama handicap is 1 stone per 2.5 ranks and Bonobo's handicap is 1 stone per 4 ranks.
I would expect that 1 stone per 4 ranks favours white heavily.
In my kids club I started with 1 stone per 2.5 ranks. But over the years, I got the impression that it still slightly favours white, so I increased it a bit to 1 stone per 2.2 ranks. After that change, it seems ranks/handicaps became more balanced between the different board sizes.
It means I give 8 stones to a 15k and 4 stones to a 6k.

Most of the games in my kids club are on smaller boards, using these handicaps. Many thousands of games were played with it in the 7 years since the club started.