In my last game the opponent pulled the 19 point trick play on me but failed during the execution. In the review with KataGo I came across novel insights on the trick play:
https://senseis.xmp.net/?NineteenPointTrickPlay
19 point squeeze trick play
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Knotwilg
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kvasir
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Re: 19 point squeeze trick play
You show this on senseis's
Without starting the engines I want to ask about the following diagram.
Without starting the engines I want to ask about the following diagram.
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Knotwilg
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Re: 19 point squeeze trick play
Yeah, let's think a little without the engines 
The question then is: can White avoid the squeeze? From the outside, Black wins the capturing race.
I'll check later. Perhaps the answer here is that it's affordable to play this way and claim/attack the top on a large scale.
The question then is: can White avoid the squeeze? From the outside, Black wins the capturing race.
I'll check later. Perhaps the answer here is that it's affordable to play this way and claim/attack the top on a large scale.
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Knotwilg
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Re: 19 point squeeze trick play
The key move here seems to be 
allowing to get out of the squeeze by setting up a ladder at 
The corner becomes seki and the fighting may continue on either side. The result is fairly even.
Note that an atari at A would disturb the seki and White would have to fill an outside liberty. In other words A is gote for White.
It would be unwise for Black to play
here instead, for the corner will become an approach ko for Black.
allowing to get out of the squeeze by setting up a ladder at The corner becomes seki and the fighting may continue on either side. The result is fairly even.
Note that an atari at A would disturb the seki and White would have to fill an outside liberty. In other words A is gote for White.
It would be unwise for Black to play
here instead, for the corner will become an approach ko for Black.-
kvasir
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Re: 19 point squeeze trick play
Looks legit but I'd point out that white has already gained 4-5 points with the hamate at this point.
I have been looking at the only game I could find of pros playing this trick move, well it is a 2 stone handicap game with Shusaku taking black and avoiding the hamate in a way that losses ~3 pts.
I find it interesting to consider which moves the computer considers to be bad in the standard "fall for it" line, that is how do we lose ~30pts playing like this.
Using my arbitrary rule that bad move is >=1.5 pts loss, then
and 
are bad. Notice how the last 4 black moves are bad, this is a pitfall for many diagrams, basically black keeps making mistakes after the first mistake. If is anyway bad, then we need to change that move but here we have given white a clear opportunity to go all-out in the fight. Starting an unpredictable fight must be a success for white when he plays a trick move in order to create any chance to win like in the Shusaku game.
The only way to avoid the trick without compromising or allowing white to start a huge fight appears to be the traditional way.
Btw, black has a more effective way to counter attack in the Shusaku game.
I have been looking at the only game I could find of pros playing this trick move, well it is a 2 stone handicap game with Shusaku taking black and avoiding the hamate in a way that losses ~3 pts.
I find it interesting to consider which moves the computer considers to be bad in the standard "fall for it" line, that is how do we lose ~30pts playing like this.
Using my arbitrary rule that bad move is >=1.5 pts loss, then
and are bad. Notice how the last 4 black moves are bad, this is a pitfall for many diagrams, basically black keeps making mistakes after the first mistake. If is anyway bad, then we need to change that move but here we have given white a clear opportunity to go all-out in the fight. Starting an unpredictable fight must be a success for white when he plays a trick move in order to create any chance to win like in the Shusaku game. The only way to avoid the trick without compromising or allowing white to start a huge fight appears to be the traditional way.
Btw, black has a more effective way to counter attack in the Shusaku game.