[net.chess] Delphi 22: Cast Off Your Chains

mclure%sri-unix@sri-unix.UUCP (10/30/84)

The Vote Tally
--------------
The winner is: 21 ... gxf5

The Machine Moves
-----------------
        Depth   Move    Time for search         Nodes      Machine's Estimate
        8 ply   Bd2       16:41 hrs	       6.0x10^7      +25% of a pawn
		B-Q2

                Humans                    Move        # Votes
        -- BR -- BQ BN BR -- BK	      21 ... gxf5	11
        ** -- ** BB BB -- ** BP
        BP ** -- BP -- ** -- **
        ** BP ** WP BP BP ** --
        -- ** -- ** -- ** -- **
        ** WQ ** -- ** WN WN WP
        WP WP -- WB -- WP WP **
        ** -- WR -- WR -- WK --
             Prestige 8-ply

Editor's Comment
----------------
One of the stronger players here at SRI (approx. 2200) says that Black has
has a gigantic positional plus in this position. It should be interesting
to see if the humans can carry through with an effective attack by
democratic vote and persuasion. Or perhaps the humans will let it slip
through their fingers and the machine will assert its cold perfection.

The Game So Far
---------------
1 e4  (P-K4)   c5 (P-QB4)  11. Be2 (B-K2)  Nxe2 (NxB) 21 exf5 (PXP) exf5 (PXP)
2 Nf3 (N-KB3)  d6 (P-Q3)   12. Qxe2 (QxN)  Be7 (B-K2) 22 Bd2 (B-Q2)
3 Bb5+(B-N5ch) Nc6 (N-QB3) 13. Nc3 (N-QB3) O-O (O-O)
4 o-o (O-O)    Bd7 (B-Q2)  14. Be3 (B-K3)  Ne8 (N-K1)
5 c3 (P-QB3)   Nf6 (N-KB3) 15. h3 (P-KR3)  Bd7 (B-Q2)
6 Re1 (R-K1)   a6 (P-QR3)  16. Qc4 (Q-B4)  b5 (P-QN4)
7 Bf1 (B-KB1)  e5 (P-K4)   17. Qb3 (Q-N3)  Rb8 (R-N1)
8 d4  (P-Q4)   cxd4 (PXP)  18. Ne2 (N-K2)  Kh8 (K-R1)
9 cxd4 (PXP)   Bg4 (B-N5)  19. Ng3 (N-N3)  g6  (P-N3)
10 d5  (P-Q5)  Nd4 (N-Q5)  20. Rac1(QR-B1) f5  (P-B4)

Commentary
----------
VANGELDER@SU-SCORE
  I vote 21. ... gxf5
  As BONO pointed out at move 19, we need to beware of a venomous trap
  after the apparently defensive 22. Bd2.  E.g., 22. ... Bf6 23. Qa3 Ra8
  24. Ba5 Qb8?? 25. Nxe5! Oh no! Deja vu.  Or 24. ... Qe7 25. Nh5 Ng7
  26. Nxf6 Rxf6?? 27. Nxe5!  Or 26. ... Qxf6 27. Bb4 Ne8? 28. Nxe5!
  White also gets good mileage out of 22. ... Nf6 23. Ng5.
  The solution is to prevent Qa3 and Ba5 with 22. Bd2 a5!  This is tactically
  justified by 23. Qa3 b4 24. Qb3 Bf6.  Now if 25. a3 a4! 26. Qd1 b3
  keeping the Q-side at bay.  If 25. Nh5 Rg8 keeps g5 under our control.
  As I mentioned in a previous note, 22. Nh5 Nf6 23. Nxf6 Bxf6 looks good
  for us.

TOM@LOGICON
  I vote 21 ... gxf5
  But I would like to avoid the upcoming trades... Maybe develop the Queen
  to b6 to add to White's troubles? Hail Discordia!

Solicitation
------------
    Your move, please?

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