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Ongoing Game
PageType: Path
Difficulty: Beginner
Keywords: Problem
Feel free to add your moves or commentary to this game, and we'll see what happens.. Please mark the most recent move! -- Matt Noonan Please also add your move to the numbered diagram (starting a new diagram every 10 moves). -- Jonathan Cano
Here's a suggestion to make this easier to follow and to make comments saved for posterity: Use the move numbers 1-10, repeat the board after 10 moves. Add comments on each move as it is played (if applicable) - the finished game will be very interesting this way. I took the liberty and reordered the diagrams so that the latest moves are at the top. --ArnoHollosi DaveSigaty: I moved older diagrams and analysis to separate pages. The intent is to make it easier to continue discussion of some of the issues raised in the comments while the rest of the game proceeds. I have labeled the pages Ongoing One in anticipation of further 'Ongoing' games in the future :-)
Earlier Analysis:
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Diag.: 'Group Rengo' : Moves 211 - 220 |
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Diag.: 'Group Rengo' : Moves 201 - 210 |
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Diag.: 'Group Rengo' : Moves 191-200 |
-- Kapunga 191: This starts the capture race so it ends in blacks favor.
unkx80 191: I don't think 188 is the correct way to play, resulting in black winning the capturing race instead. 188 should be played at 189.
-- HolIgor 198: At last we came to the yose in all corners of interest. 198 seems to be sente. Can Bill tell how much it is worth? By the way, wouldn't it be nice to have a treatise on the counting yose technique here? I am still quite confused about different system of counting and how to apply them. A pointer to a place where this could be learned would be nice too.
BillSpight: The top left corner is a 1 point gote (MiaiCounting). See OngoingGameOneUpperLeftYose. :-) However, W 198 has heated things up. ;-)
As for yose calculation, Professor Berlekamp and I are planning a book that will cover both traditional evaluation and our recent advances in ko evaluation. The first thing to do is to master gote evaluation. For sente you can start by assuming that they are gote, and then seeing that they are not, because if they were, the response to them would be bigger than they are.
TakeNGive: Ok, i'm guilty. I moved Black 199 one point to the left of tengen. Then i realized White could force a ko in the upper left, and changed the move. Sorry.
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Diag.: 'Group Rengo' : Moves 181-190 |
--DaveSigaty 184: This may be a more exciting finish than W needs but it "looks" like it works :-) Who is shorter of liberties?
HolIgor: Black cannot cut at 185
HolIgor: Black's attempt to cut off white center stones seems to fail
unkx80 184: Whoops... I have read the situation wrongly. Sorry. However, may I ask whether 175 would be better off playing 1 space below instead?
HolIgor 185: Let's play anyway. There is a lot of interesting variations left though the score has shifted to white's favour. About move 175. I suggest unkx80 to post an improvement. Then we will know where black blundered. Personally, after playing 172 I was very intrigued if black connects. A loss at the right side was not that big, but the fight in the center was obscure. And I think that at 167 black had to fight ko. At least take it once. One could always surrender later. At the same time white could blunder with ko threats making black thicker.
DaveSigaty 186: Here is where the potential trade off between B's center stones and the right side comes in. I think that B can't both save his stones and prevent W from extending to the right from the marked stone. B's choice.
HolIgor 187: There are only about 8 points in the region to the left and the balance of killed/saved stones here is much larger. But the score is now in the range of 10-20 points for white. I don't know if playing yose in a game the result of which is known is interesting enough. We do not have proper mechanism of resignation. I guess it would be a silent resignation, which means that if somebody wants to continue, he is welcome to post moves for black. I am sure that white will reply.
Is it time to start OngoingGame2? And I think that all participants should share their impressions from the game on WhatWentWrongInOngoingGame1 page.
DaveSigaty 188: The B cut at 187 is possible but only just. W can use B's shortage of liberties to seal off more than 15 points of territory at the top before extending on the right. I agree the game is decided now. The uppper left corner and lower left corner are interesting endgame shapes that are worth knowing. What is correct for OngoingGameOneUpperLeftYose and OngoingGameOneLowerLeftYose, as well as OngoingGameOneUpperRightYose ?
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Diag.: 'Group Rengo' : Moves 171-180 |
DieterVerhofstadt 175: Necessary. If next white hane, little reading required.
HolIgor 176: Obviously white hane. This way it is most interesting. It seems that black cannot cut at the moment.
AndreEngels 177: Black is in problems, saving the stones on the left and those in the center does not seem to be simultaneously possible.
unkx80 177: I beg to differ. Black should be able to save both groups, but how... I guess I should not comment until the moves are played out.
DieterVerhofstadt 178: differ again. I think a trade of the marked stones is coming up. Unmark as you please.
DaveSigaty 180: I think that almost any stones may live or die in this situation. I don't think that B can save both groups without W breaking into the right side using the aji of the "square-marked" stones. W needs to be careful to avoid traps on her stones in the center as well.
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Diag.: 'Group Rengo' : Moves 161-170 |
DaveSigaty 169: Everyone seems to think the game is over! I think there is still a lot to sort out in the center and the yose. I'll bite with this play.
DieterVerhofstadt 168 : another PositionalJudgment ?
Alain Wettach (163): seems necessary to prevent white a. I think that white could have played at a instead of 162. 159 was probably a mistake.
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Diag.: 'Group Rengo' : Moves 151-160 |
Matt Noonan (159): Not sure about the timing here, but I think it is big enough to warrant white's response.
Andre Engels: If white has to answer after 161, there is no problem, but if white can take sente, then 159 might well be too small for this stage of the game.