Interesting progressive game

In progressive chess white has 1 move, black has 2, white 3, black 4,
and so on. A sequence finishes if you give check, and a person's first
move must get them out of check, lest it be mate.

In the following real game:

1. d4
2. c5, cxd4
3. Qxd4, Qb6, Qxd8+
4. Kxd8, g6, Bh6, Bxc1
5. Kd1, Kxc1, c4, c5, Nc3
6. Na6, Nxc5, b5, b4, bxc3, cxb2+
7. Kxb2, Rc1, Rxc5, Rh5, Rxh7, Rxh8, Rxg8+
8. Kc7, Bb7, Bxg2, Bxh1, Rxg8, Rh8, Rxh2, Rxf2
9. Kc3, e4, e5, e6, exf7, f8=Q, Qxf2, Qe1, Ba6

1. Black looks finished after white's 9th move, with his king cut off
from the knight on g1, and all his pawns blockaded. What did black
play to force white's resignation?

2. Which move of white's 9th could he have changed to prevent black's
winning 10th?

3. Is the game pure (i.e. did either player miss a mating sequence at
any stage)?

Ciao,
Chappy.

.

Relevant Pages

  • Re: Need a term here:
    ... Robert Lieblich wrote: ... > Lest there be any doubt about what I mean when I bring up sequence ... > Anyone whose nose doesn't turn up at the sight of that one is one ...
    (alt.usage.english)
  • Re: solve for chess
    ... >> the movethat result in the shortest mate. ... I'm not talking about forced mates. ... Chess is a finite two-player game of perfect information. ... > sequence is unknowable since it requires knowledge not only of your own ...
    (rec.games.chess.computer)
  • Re: Dispatches from an alternate universe
    ... Not sure exactly what you're querying there. ... Much more common is the Scholar's Mate: ... thereof) has been seen thousands and thousands of times in tournament games. ...
    (rec.arts.sf.fandom)
  • Re: Finding the general term of a sequence
    ... > How do you find the sequence of diameters? ... lest talk in radius ... lest call the center of C1 is Q1 ...
    (sci.math)
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