Second Lesson In Throwins / Solution

Beginning of the answer  

The answer starts like this.

Where do you think Black plays next ? If you've recently learned about throwins, you're tempted to try a throwin at a next, right ?

The reason I call this the "second lesson" in throwins, is that if the first lesson is "when to play a throwin", perhaps the second lesson is "sometimes the throwin is wrong !" .

Such is the case here, as shown below.

The throwin is wrong  

= .

The result is shown in the next diagram.

White has a or b  

Black has failed, because White is threatening both a and b.

The correct answer is to peep instead of throwing in. The second lesson in throwins is, "think about the throwin, but don't assume it works !"

The next diagram shows the correct answer.

Correct answer is  

is the correct next move, and the subsequent moves show Black's response to one of White's attempts to escape.