While going over old professional games with Lizzie interface (Leela Zero), I noticed some very interesting mistakes which even surprised me and I wanted to share them here with all of you. I hope if people encounter similar positions in their own games, to be able to avoid these mistakes and to be more successful.
The games showed below are all from 1st ACOM Cup played in 1994 and analyzed with 15 blocks trained on 40 blocks games provided by bjiyxo.
O Rissei 9p takes black against Ishida Akira 9p (B+0,5). White plays keima move on the lower right which is a huge mistake ! White’s group on top is not really strong and the turning point at A is crucial for both players.
Black took this point and now white has to defend at A, although white defended at B which is a slight mistake according to Leela. The position is good for black, you can see that black stones on top left are working well together and they are efficient. I will make additional article soon about why B is a mistake. I remember when Zhao Baolong 2p was explaining why B is not a good move and how I was just watching completely amazed of how simple it looks like when he is showing it.
White had to take the big point himself and to strengthen his group at A. Later, white can continue by playing at B or C, which depends on what white wants to do on the board. Be sure to make your groups strong and to not miss points like this !
Awaji Shuzo 9p takes black against Yuki Satoshi 8p (W+4,5). White took a very important point with the last move and now it is the time for black to play active and to get into the center. As we can see the center is where white’s influence grows most.
In the actual game black took the point at A which is really slow and white could have played the last move, however, he choose different plan. Comparing this to the game, there is not much difference since white in both variations took the center. Black’s move at A was just too slow and out of importance right now.
Black had to enter the center with two space jump or playing at B, this indirectly will put pressure on white’s marked stones, but it also focuses on the center which grows even bigger.
In the game white attached and exchanged 1 for 2 and then played fancy move in the center. White got what he wanted and now black has to invade, we can say that black’s play was too slack.
Cho Chikun 9p taking black against Okada Shinichiro 6p (B+5,5). White just blocked at A and black defended with extension, but was it necessary to defend ? We can see that white is growing his moyo on the left and after black’s extension white will get another move to protect it. Cho Chikun was very brave in this situation and choose to play on the top which is considered bad by AI, I cannot really say it is a huge mistake, because Cho Chikun likes to invade and to settle groups, so as long as it fits his style, it totally fine for him. However, I believe there aren’t many people as good as Cho at invasion, so it might be better to avoid complications.
It would have been better to invade now, before white adds another move. He might be scared about what will happen if white wedges at 1, black will have to give up with sequence up to 4, he might lose the stone at A, but it is not as big as invading on the left.
White got a chance to add another move in the actual game and black’s invasion was very hard. Yes, black won the game, but Cho didn’t need to make the situation so complicated for himself according to AI.
This is the last example between Tono Hiroaki 9p taking black versus Tei Meiko 9p (W+3,5). White connected at A and black followed with B which lets white extend and get a move towards the center. This is a normal sequence on the top, we can call it a middle game joseki even, because it appears a lot in games.
Black had to not follow the pattern blindly, but to play atari at B, which is the most important point right now. This creates a good influence for black in the center and is certainly better than letting white extend over there. Black was probably worried about white’s cut at C, but according to AI black can just let it go and this variation is better than connection at A.
I hope you liked this article and it was helpful, I believe you can find similar cases in your own games very fast and avoid these mistakes!Follow me in social media: