
Appreciating magical middle-game moves: The magic ladder

Among Go techniques, I’m afraid that ladders are usually considered fairly simple. Regardless of level, anyone can use ladders in their games, and once you have learned the trick to them, it’s difficult to forget. But as many players improve, they tend to say that ladders are only good for capturing a stone or two. If a ladder works, then it works, and that’s all that needs to be considered. In fact, there are some real-game uses of ladders that might shake your belief in their supposed simplicity.
This game is from the 20th round of the 2007 Jinli Cup, a major Chinese team tournament. In this game Wang Yang holds white against Ma Xiaobing. If you think that ladders are only played out in novice games, than this example might give you a new conception of Go.
Up to this point, white has cut at 1, and black has strongly resisted with 2. White here is like a predator trying to break out of his cage, but here it seems that the bars are sturdy enough. How should white continue?

First let’s look at the original situation. The first major fight broke out in the upper left, and after a big trade, white lost four important stones in the middle. However, the white stones still have a lot of aji, expecially at the cutting point of A, where the ladder is a potential powderkeg. Right now the ladder doesn’t work, but if the right conditions arise, it could be a catastrophe for black. To prevent any future ladder kill by white, black has made a thick connection in the center, and it seems that this should prevent any ladder breaker. However, Wang Yang 5d doesn’t forget about the ladder, and bearing it in mind attaches to the seemingly impregnable bottom right corner. Black squeezes at 2, showing no mercy in strangling the white stones, and a fullscale corner battle ensues.

Both players should be able to read to this point with perhaps a degree of doubt. With 1 white is already aiming towards a ladder breaker, but Wang still has a long road ahead of him. Up to this point it seems like Ma Xiaobing 4d is the stronger player, but even with all the tricks up his sleeve there is still an undercurrent to the game unknown to him. But is Wang Yang himself even aware of it?
When white leans at 1 and hanes at 3, then extends solidly to 5, he looks very comfortable with his surroundings. Black caps at 6, and I suspect that 9 out of 10 players would do the same. Breaking out with white 11-17 wouldn’t work in most situations, but now both players will have to see past the local result. Here we return to the original problem. Black’s fence has no definite holes, and neither of the cutting points at A or B has any killing power. At this point, would you be able to factor in the ladder into your calculations? If so, then you certainly have a fighting spirit.

If we look at this as a life and death problem, then we should be able to see in under five minutes not only that can white live, but that he can live quite elegantly. Because of the cut at 19, the black “iron triangle” now doesn’t look so thick. White 1, 3, and 5 start to pursue the ladder, and after black is compelled to flee with 2-18, white 19 is sente, and then the hanes at 21 and 13 take the four black stones. However, while white lives with his dragon, he still hasn’t won the game. Even though this is a lightning tournament, both players still feel this in their gut. Now let’s look at how they actually played.
Actually, since the cut at 1 is the key move in this sequence, white can play it before the ladder, setting up an ambush. After seeing this move we should already have a sense of what white has in store, since black has no way to connect as he can at 18 in the previous diagram. This way white’s two lower stones become a “turtle shell”, preventing black from capturing his other group. Now let’s see if white 1 is actually sente. If black tenukis and prevents the ladder with A, white plays B, black C, and white D, capturing the black stones. Compared with the last diagram, this is advantageous for white, since he can live without sacrificing so many stones in the middle. Black cannot endure this result, so he hanes with 2…
After white’s cut on the third line, he starts the ladder right away. Ma Xiaobing overcame his hesitation and played through the ladder, surprising most onlookers, since both refused to abandon playing through the ladder. Up to black 14, the enticement of taking the two black stones in the middle is too great.
In this variation, while white breaks through to freedom, black forcing move at 1 is very big, and black has definitely come out of this trade on top. Ma Xiaobing is certainly hoping for this result, and waiting patiently to play this card.
Wang Yang suddenly paused, and Ma Xiaobing gasped in surprise, realizing his mistake, but it was already too late. White mercilessly played 1 and 3 in sente, capturing the four black stones. Here black 4 and 6 were the best Ma could do to save the situation and try to recoup his losses. After turning out with 5, white uses the ladder not only to save his dead stones, but also to smoothly kill the black group, turning the game around. At this point white should have an easy win.
After seeing this game you should give a cheer for Wang Yang, and have some sympathy for Ma Xiaobing. Actually he correctly read 99% of the Wang 5d’s moves, but his 1% inaccuracy allowed him to “cooperate” in making this a famous game.
Ma Xiaobing never at any point forgot about the potential of the ladder to escape the white stones, and he even saw the cut on the third line as well, but his mistake was thinking that the strongest way for black to play was as in diagram 7. For that reason the result was totally beyong his expectations, almost destroying his chance of victory. Looking at this game, I think it will continue to come to mind for most players as a classic example of a “living ladder”.
DIAGRAM 9
This example comes from the 2002 Korean KAT Cuo between Lee Sedol and Hong Chang-Sik. The bottom righthand corner is a result of the “Sword of Muramasa” joseki, and it is difficult to say who came out on top. The focal point right now is the upper lefthand corner. After black hanes with 1, white 2 and 4 display correct instincts, since right now the ladder is not good for black. Black is now looking for a ladder breaker, but since his bottom righthand stones can immediately be taken, he does not have a strong point where he can threaten breaking the ladder. However, white is being a bit absent-minded with his liberties in the lower right.
DIAGRAM 10
Black ataried the ladder, and white started running blindly through a fog, since it seems obvious that he can escape. White 2 extended without even thinking, and immediately black kept up the chase! White at this point must have been rather surprised, but now it’s already too late to turn back. After black continues the ladder for 15 moves and captures with 31, all the white stones in the corner are dead. After black finally noticed the double capture he couldn’t decide which to choose.