Move sequences are automatically highlighted and made clickable. If the previous move number appears earlier in the comment, the sequence continues from that move. Otherwise, it's treated as a variation from the main line. This can be error-prone with multiple sequences in one comment, so please use the Preview button to check your work before posting.
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28.h20 29.f20 30.resign
28.g20 29.g19 30.resign
28.i21 29.g19 30.g22 31.e20 32.e23 33.c21 34.resign
28.???
|26.k20 27.i18 28.g22 29.m18 30.o20 31.k22
Now, if David had played 17.r6, Klaus might pressed even further toward the upper right. But while 17.s7 isn't enough to strengthen David's path to the bottom, it threatens to be enough to make a slightly strengthening move on the next turn (maybe u6 or v4), so Klaus stops there.
So, more direct answer: Yes. Klaus knows David can connect Q12 all the way to the top. He's just following sound Twixt principles. It's like maraca said about his recent game with Csaba: "always extend your ladders to the max."
It seems unlikely that David could have taken advantage of the i15-left gap in concert with the lower right battle to scrape a victory together, but then again, the preceding discussion already established that there was a potentially tricky line extending to the lower left, so it's not out of the question. I haven't analyzed that possibility, and Klaus probably didn't either, because he knew he didn't have to. He knew he could pretty much sink that possibility by extending his ladder to the max... that is, if he even bothered to think about that. He probably just intuitively knew to extend his ladder to the max, because it could only help him.