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33

Zeiss isn't completely correct, this is actually the less common reason for omitting the I. The more common reason why I is often omitted where it would normally be expected between H and J is because in sans serif fonts the uppercase "I" is completely identical to the lowercase "l" (L). In a go board if you see a move noted in uppercase as I6 or lowercase ...

20

Suppose there is a black stone in the corner but it is impossible for black to survive, no matter how well played. By convention, both sides recognize this and the black stone is counted as a prisoner. If either side doesn't accept the convention, both sides will alternately play until the situation is resolved (in favour of white). At that point, black and ...

19

AlphaGo Now there is AlphaGo by Deep Mind, a company recently bought by Google playing currently a match against 9p Lee Sedol. It is the Deep Blue of Go. EDIT: The final result of the match of five games was AlphaGo 4 – Lee Sedol 1. This confirms the former conjecture: AlphaGo is the Deep Blue of Go.

19

In tsumegos where you should kill a group, the best (and thus correct) answer is always the solution where you kill unconditionally (if possible). Only if there is no unconditional kill the ko would be the best (correct) solution. The basic idea is that a tsumego is a local fighting position which you should solve without knowledge of the rest of the board. ...

19

In most cases, where "I" is omitted between "H" and "J", it's to avoid confusion with number "1". It's also common to omit the letter "O" for the same reason (confusion with number "0", more of a problem in some fonts than others).

18

Yes. That white chain has only two liberties - A and the space next to A. If black fills both of them the chain will be captured. None of the surrounding black stones are vulnerable to capture because of their eyes, so white has no defense against this play. The space next to A will have no liberties when black plays in it, but that is okay because ...

15

On the contrary, studying tactics for go is essential. Books or online resources on Joseki, Tesuji, and Life and Death situations are good places to start, followed by general opening strategy as you gain experience. Playing games on 13x13 boards as well as the standard 19x19 will assist you in gaining experience in the balance between influence to the ...

15

Yes, but Black doesn't need to. Since each of the surrounding groups already have two eyes, there's no reason to play those stones. In fact, it will cost Black two points in Japanese scoring. If one of the outside groups was in danger, then you could play at A and the point next to A to remove the group. When the second stone is played, both the two ...

14

First off, count the current score. If you're winning, do not invade. Just make sure you keep white small enough that you still win. Let use further presume that black would be losing. You counted, so you know by how many points. A move around c could be parried with a sacrifice of two white stones while sealing off the rest of the upper right corner ...

12

In most games (as already noted) the two rulesets produce the same strategy and outcome. Differences between the current Japanese and Chinese rules: Japanese counts enclosed territory (of groups able to form two eyes) minus prisoners (stones that the opponent was able to capture). Chinese counts all area: every intersection is attributed to whichever side’s ...

12

I would argue that AlphaGo's advantage cannot be significantly attributed to the novelty of its moves. The original public AlphaGo games were those against Lee Sedol, the second ranked player in the world, in March 2016. At that time, as mentioned, several of AlphaGo's moves were novel, and surprising to Lee Sedol and observers. Then, after players had had ...

12

Summary You needed to finish the game, after which, assuming optimal play, White would have won by a very large margin (if it was their turn next) or a large margin (if it was Black’s turn). The rules of go do vary a little, but it very rarely makes any difference to who wins, and certainly not in this case. Contents Summary (above) Contents Your ...

11

There is no ELO rating in go. And even no official international rating at all. A common question in go forums is "how does my rating in [whatever country or online server] compare with [other country or online server]". The European Go Federation is maintaining an international rating system where Ke Jie is rated 2956. goratings.org is an individual ...

11

Molasses ko: http://denisfeldmann.fr/bestiary3.htm#mol "The semeai in figure 11 is probably the worst known case of repetition. Known as "molasses ko", ..." Denis Feldmann's Go Bestiary is a compendium of various things (interresting semeai, life and death, edge cases, incredible problems, rules edge cases, weird sekis, etc).

11

After a piece and/or group is completely out of liberties, it is removed immediately. The only rule that would really prevent you from placing a stone back on the captured space is the ko rule, in which you can't re-place exactly the same stone that was just captured in such a way that it completely re-creates the board position from the previous turn (...

11

Yes, this is possible. It requires the living group to circle back on itself like this: \$\$Bcm0 \$\$ ............ \$\$ ...OOOOOO... \$\$ ..OOXXXXOO.. \$\$ .OOX.XX.XOO. \$\$ .OX.XOOX.XO. \$\$ .OXXO.OOXXO. \$\$ .OXXOO.OXXO. \$\$ .OX.XOOX.XO. \$\$ .OOX.XX.XOO. \$\$ ..OOXXXXOO.. \$\$ ...OOOOOO... \$\$ ............ Here, each of the eight black eyes is locally a false eye, but because ...

10

The key is that killing the black stones doesn't give White an eye. After White captures the two stones, Black will throw in at the same place he played in #3. White can capture that stone too, but later in the game the stone above the capture will be placed in atari, and White will have to fill in the "eye" on the right. Because that can happen, it is a ...

10

Here's the AlphaGo team's paper that has all of the details (behind a paywall): http://www.nature.com/nature/journal/v529/n7587/full/nature16961.html I gave a couple of tech talks about this recently. This one is about how AlphaGo works and the match with Fan Hui 2p: https://www.youtube.com/watch?v=HTDxpxmFRGo I gave another talk last year about why it's ...

10

In general, if you realize that you can't win, you should resign. It's considered rude to make plays that will only allow you to catch up if your opponent makes a stupid mistake. I don't think Go is different from chess in this way. I would say around half of my games end in resignation.

10

I think the easiest way to think of this is in terms of options, and the freedom to take whatever options benefit me. In your example, you have no options: You need to win this ko, or you will lose. However, in my case, killing you might not be my only option. I could kill you and swing things thirty points in my favor, or if I felt like it I could grab ...

10

Common starting practices are to open by placing stones on a Hoshi (4-4 point), or close to it, in order to "claim" that corner. As the players are trying to secure as much area as they can, it makes sense to start out in a place that is easily defended, and that is something that's true for corners more than for any other location on the board at the start ...

9

In all official rules that I know this means instant forfeit of the game. Of course, in casual play, mistakes like this can be allowed to take back at the will of the players. In tournaments I would strongly advise against making such a mistake as well as trying to ask for a take back. If the other player does not seem to allow a take back by his own active ...

9

I started writing another comment, but it got too large, so I'm putting this as an answer instead. Your other question suggests that you're envisaging playing go on the surface of an actual sphere/torus. In particular that question mentions that you want "all nodes more or less equidistant". Searching on the internet, I didn't find much evidence that this ...

9

There are lots of tutorials. Playing games making mistakes, and learning from them is the way to improve. However, when you're just starting, you make so many mistakes that it can be overwhelming. This is where having a human teacher or a book can help, because they can give you specific things to work on. Keep your app, but playing just against a computer ...

9

Almost all go boards are x by x, where x is an odd number (e.g. 9, 13, or 19). The point is to have the product yield an odd number of potential points. So that there would be an odd number of points in the game and a clear winner. (In the Japanese counting style of "points," it is possible for both players to have the same number, but under the Chinese ...

9

White Q19 is a mistake. The correct move is R18. Then Black can't connect at Q19 because the stones would still be in atari. \$\$c White survives! \$\$ --------- \$\$ ..63512.- \$\$ .XXOO4OO- \$\$ .XOXOOX.- \$\$ ..OXXX.X- \$\$ ......X.- \$\$ ........- After the capture, a and b are miai to make White a second eye. \$\$c Resistance is futile! \$\$ --------- \$\$ ..Oab.O.- \$\$ ....

9

I can only answer the Go perspective. I hear it is pretty much banned in chess. Paper notebooks, or preferable kifus, are always allowed. If is not uncommon for tournament directors to supply players with kifus for free or cheap. I've often seen people use electronic notebooks in Go tournaments to record their matches. However, this is usually accompanied ...

9

Sadly I do not have a reliable source for this answer, but as far as I know, continuing when clearly behind is not generally considered rude, at least at professional level. One reasoning was that it is good manners to try your best until the end. Of course one would still try to play good moves to minimize the loss, not just play on for the sake of it. ...

9

The game is incomplete. Literally nothing is "surrounded" here, and if the game ended in such a state nobody would get any points at all until you can mutually agree on which groups are "dead" and which ones are "alive", since right now, none of the groups are unconditionally alive. Your first example presumes the inside black group is dead, the second ...

8

TLDR: Putting stones on the board is not always possible. Reading is super important. Practice it with tsumego and apply it in games. You're definitely right that it has a strong impact on the outcome. Reading is the most fundamental skill in Go, and improving in that area is absolutely required to become a strong player. In serious games, it is usually ...

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