http://kingcrimsondiscipline.blogspot.jp/2014/08/4th-file-rook-vs-static-rook-2.html
33.B*7g 34.B*5d 35.R-2f 36.L-1b (Diag.1)
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| Diag.1 |
B*5d may look strange at a glance, but it serves as both attack and defense, watching the rook's head indirectly and aiming at a pawn with B*7f. Gote is expecting this bishop to work well. If sente attacks with P-2d against B*5d, it would proceed with Px2d, Sx2d, P-3g+ Sx3g, P*2g (Diag.2).
In addition, instead of B*5d, P-6e is also selectable, which attempts to drop B*6d.
The rook cannot take the pawn in Diag.2. P-4f would be a severe move threatening to take the rook with the bishop and promote the pawn with Px4g+ at the same time. Thus, the meaning of R-2f is to avoid the threat beforehand. And, Although Yamada Joseki indicates this line, I suppose it's also possible to take it with the knight when P-3g+. Continuing with P*2g, Rx2g, P-4f, Sx3c+, Nx3c, R-2c+, it would be a close game. (Diag.3)
The lance moves up to 1b in preparation for the attack from P-2d. After the silver is exchanged, the bishop on 7f cannot take the lance directly.
37.P-2d 38.Px2d 39.Sx2d 40.Sx2d 41.Rx2d 42.P*2h (Diag.4)
The rook on 2d cannot take the knight in the next because the knight has been strung by the bishop. So, gote doesn't need to guard against Rx2d. Here, P*2h is the counterattack gote has been preparing for since B*5d.
43.Rx2h 44.P-4f 45.Px4f 46.P-3g+ 47.Sx3g 48.S*2g (Diag.5)
The sequence from P*2h is one of the characters of Yamada Joseki.
Sacrificing the pawns with P-4f and P-3g+, the bishop's path is opened clearly to 2nd file. And then it becomes possible to stop the rook's line with S*2g. When P-4f, promoting the rook to 2c is met by Px4g+, Sx4g, P*4f, S-3h, S*4g (Diag.6). Breaking the 4th file, gote is better.
Instead of S*2g, P*2g is also considered. However, after R-4h, gote has no strong candidates to attack. If gote plays S*3i, it would proceed with S*3i, R-3h, P-2h+, Sx2h, Sx2h+, Rx2h Rx4f, S*5e (Diag.7). The bishop-rook fork with S*5e gives an advantage to sente.
49.R-4h 50.P*3h 51.R-4i 52.Bx7f (Diag.8)
Dropping the pawn on 3f instead of P*3h, there would no subsequent attack after the silver run to 2f. On the other hand, sente is aiming at P*2h in the next. So, It's not a good move.
In reply to P*3h, playing with P*2h, it will proceed with P-3i+, P*2g, Bx2g+ (Diag.9). In spite of gaining a silver, gote has a little advantage because the horse and the tokin (promoted pawn) are strong pieces which can take the materials back immediately.
Bx7f may look dangerous as sente would play P*2h, but, gote has the way to help the silver here.
53.P*2h 54.P-3i+ 55.Rx3i 56.P*3f 57.Px2g 58.Px3g+ 59.Rx3g 60.Rx4f (Diag.10)
Using the pawn gote just took, the silver exchange is done by P-3i+, Rx3i, P*3f, Px2g, Px3g+, Rx3g.
After the trade, as the silver is not on 3g, the rook can career off to 4g.
P*4f or S*4f will be played at Diag.10 to prevent the rook from invading. It's still an equal game.
These lines are the mainstream in Yamada Joseki.
If you have any questions, please ask me in the comment field. I will answer as much as possible.
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| Diag.2 Gote is better |
The rook cannot take the pawn in Diag.2. P-4f would be a severe move threatening to take the rook with the bishop and promote the pawn with Px4g+ at the same time. Thus, the meaning of R-2f is to avoid the threat beforehand. And, Although Yamada Joseki indicates this line, I suppose it's also possible to take it with the knight when P-3g+. Continuing with P*2g, Rx2g, P-4f, Sx3c+, Nx3c, R-2c+, it would be a close game. (Diag.3)
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| Diag.3 |
The lance moves up to 1b in preparation for the attack from P-2d. After the silver is exchanged, the bishop on 7f cannot take the lance directly.
37.P-2d 38.Px2d 39.Sx2d 40.Sx2d 41.Rx2d 42.P*2h (Diag.4)
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| Diag.4 |
The rook on 2d cannot take the knight in the next because the knight has been strung by the bishop. So, gote doesn't need to guard against Rx2d. Here, P*2h is the counterattack gote has been preparing for since B*5d.
43.Rx2h 44.P-4f 45.Px4f 46.P-3g+ 47.Sx3g 48.S*2g (Diag.5)
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| Diag.5 |
The sequence from P*2h is one of the characters of Yamada Joseki.
Sacrificing the pawns with P-4f and P-3g+, the bishop's path is opened clearly to 2nd file. And then it becomes possible to stop the rook's line with S*2g. When P-4f, promoting the rook to 2c is met by Px4g+, Sx4g, P*4f, S-3h, S*4g (Diag.6). Breaking the 4th file, gote is better.
Instead of S*2g, P*2g is also considered. However, after R-4h, gote has no strong candidates to attack. If gote plays S*3i, it would proceed with S*3i, R-3h, P-2h+, Sx2h, Sx2h+, Rx2h Rx4f, S*5e (Diag.7). The bishop-rook fork with S*5e gives an advantage to sente.
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| Diag.6 Gote is better |
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| Diag.7 Sente is better |
49.R-4h 50.P*3h 51.R-4i 52.Bx7f (Diag.8)
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| Diag.8 |
Dropping the pawn on 3f instead of P*3h, there would no subsequent attack after the silver run to 2f. On the other hand, sente is aiming at P*2h in the next. So, It's not a good move.
In reply to P*3h, playing with P*2h, it will proceed with P-3i+, P*2g, Bx2g+ (Diag.9). In spite of gaining a silver, gote has a little advantage because the horse and the tokin (promoted pawn) are strong pieces which can take the materials back immediately.
Bx7f may look dangerous as sente would play P*2h, but, gote has the way to help the silver here.
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| Diag.9 |
53.P*2h 54.P-3i+ 55.Rx3i 56.P*3f 57.Px2g 58.Px3g+ 59.Rx3g 60.Rx4f (Diag.10)
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| Diag.10 equal game |
Using the pawn gote just took, the silver exchange is done by P-3i+, Rx3i, P*3f, Px2g, Px3g+, Rx3g.
After the trade, as the silver is not on 3g, the rook can career off to 4g.
P*4f or S*4f will be played at Diag.10 to prevent the rook from invading. It's still an equal game.
These lines are the mainstream in Yamada Joseki.
If you have any questions, please ask me in the comment field. I will answer as much as possible.
thank you very much for a great blog. I have a question about diagram 1. assuming sente is playing 4th file rook and lance is already moved respectively. what would be the plan. looks like sente do not have a lot of moves to make
返信削除You're right. In that case, I suppose, in reply to △S-46, it's better to play positively like ▲P-45 △Bx33+ ▲Sx △Sx35 ▲S-44.
削除Thank you. I guess similarly in diagram 1 sente can make a move G68 and wait for gote's move answering P14 with P16
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