Kaizens Heavy Plastering

Mvs. 21-30  

is a good defensive tesuji. However is a mistake, falling into the trap.

End position  

Black has got overwhelming whole-board influence (as well as many ko threats starting with a and b) in return for 40+ points of White territory.

kmr - this whole sequence is very suspicious. Assuming black has ladder, its much easier to kill white playing at 24 and killing white stones in ladder. However if ladder is not good for black, then white move 28 just helps black. White should play at 30 immediately, and black has no chance to kill white or squeez them (unless i miss sth).

Variation  

hnishy You're right, White should have played here. Black's attempt fails to , assuming the ladder to the lower left is bad for Black (according to Hashimoto Utaro).

Variation alt  

Now, after nice hane , if ladder is not good for black, he should play probably either ladder breaker at lower left gaining sth there for loss at upper side, or play "a" forcing white to either take 3 stones (bad for white), or jump to "b" (but thats low and black is gaining more powerful ko threats there, and fix his shape). But anyway, if ladder is good for black, white cant allow this, must play at 15. If bad for black, then he should not cut 2 white stones (unless hoping for swindle).